A Demon Lord’s Tale: Dungeons, Monster Girls, and Heartwarming Bliss


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One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.

This is Yuki’s story, my story. It tells the tale of how I spent my days after settling down in a dungeon with a self indulgent, “supreme” dragon girl and a young vampire.

Associated Names
One entry per line
I Became the Demon Lord so I Created a Dungeon and Spend Heartwarming Time There with Non-Human Girls
Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono Suru
Related Series
Lazy Dungeon Master (8)
Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ (3)
Hisshou Dungeon Unei Houhou (3)
Demon Sword Maiden (2)
I Was Caught up in a Hero Summoning, but That World Is at Peace (2)
Demon Noble Girl ~Story of a Careless Demon~ (2)
Recommendation Lists
  1. Interest
  2. Lo que leo
  3. Web Novels or Light Novels
  4. Isekai With OP MC's
  5. Easy-going stories

Latest Release

Date Group Release
06/13/21 CardboardTL c365c365
06/04/21 CardboardTL c364
05/28/21 CardboardTL c363
05/17/21 CardboardTL c362
05/13/21 CardboardTL c361
05/06/21 CardboardTL c360
05/05/21 CardboardTL c359
05/02/21 CardboardTL c358
04/28/21 CardboardTL c357
04/18/21 CardboardTL c356
04/18/21 CardboardTL c355
04/14/21 CardboardTL c354
04/09/21 CardboardTL c353
04/07/21 CardboardTL c352
04/06/21 CardboardTL c351
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85 Reviews sorted by

New Romanov_Py rated it
May 27, 2021
Status: c362
Tbh, this is one of the most relaxing works I´ve ever read. While the development of the harem was almost impossible to evade because of how things were going from the beginning, the author built it in a sublime way, justifying it well and with Lefi as the eternal and most important woman of all. If you have time I highly recommend it.
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terror blade simp
New terror blade simp rated it
May 24, 2021
Status: --
my fellow slice of life reader or not, this is THE right place to dig and surely you will be rewarded with gold.

but I will warn you as, you might get diabetes


contain 90% finely written slice of life plot and 90% romance and 100 diabetes inducing momemt with bit of action all together perfect stuff to make your day

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Darxen rated it
November 26, 2017
Status: c185
Edit 2019 - TL:

Since I stopped reading a while ago since I had read the last one (raw) at the time I do not remember very well, but, I do not really remember that the MC was so rude to all the other characters, that the level of intelligence was so low or that in general the interactions between characters were so lack of emotion.
I guess I'll stick to the original version and forget what I've read

Previous 2017 - Full Raw:

Here we see that the voting should not... more>> be allowed to novels that don't have a defined minimum of chapters (unless they are short) or force comments to those who vote and avoid bad votes because of prejudice, I will not take into account the translation since I read it in its original language, so.

You must read it!!... you don't need to thank me.

5 stars - For not being boring (as an agent who wants to be a teacher in another world).
5 stars - For true comedy (not like that with a perverted highschooler with a red glove and his oppai here oppai there).
5 stars - For the interaction MC - heroines (and that's it, you should have enough with this, comparing with other novels that are better voted).
5 stars - Because I want a dragon Waifu (and caress her little horns and wings, don't forget the wings).
5 stars - For being more sweet than child-raising novels (that have no emotions in a world without cuisine).
5 stars - For never focusing on food (like mayonnaise and mayonnaise, wait, also add soy and...).
5 stars - For being a well executed cliché (although all the novels have clichés in some degree or another).
5 stars - Because the dragon Waifu deserves it. (no dragon Waifu no life)
5 stars - Because the harem is not a joke (it takes time, as well as the plants you have in your room because you are alone in this life...)
5 stars - Because I feel the love (that she never gave me...).
5 stars - Because this web doesn't accept anymore.

Bad jokes aside, the strength of this novel is the interaction between the main characters, I still think how I read more than 100 chapters without getting bored in one day, maybe the weak point (if it can be considered in that way, in a novel in which development is like a slice of life) is the variety of characters (as well as male characters) and the long development (which seems to be introducing more and more), even so, does not tire, like having a teenager with a smartphone with a pseudo loli harem, and the romance is not superficial and forced, as in that of a programmer who only wants the high elf or the pseudo political romance of the eighth child of a low-ranking noble. Even so, what many forget is about the dragon Waifu!!, how dare they, even if Kira forgives them, just remember those meromero (メロメロ) scenes, break my heart like a piñata... <<less
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Sherrynity rated it
December 5, 2017
Status: c292
This one is thoroughly a slice of life novel, alright. What you should seek from this novel isn't fighting scenes, or schemes, or politics, or whatever heavy matters you could think of. It's a f*cking Slice of Life spiced with Comedy and mundane, down-to-earth, normal interaction between sentient beings who love to live their life leisurely.

Just enjoy this novel as it is. Why are you hoping something like Dungeon Defense from slice of life, geez.

—edit: as per my current chapter, my opinion hasn't changed. Not even a bit. It's... more>> still a f*cking slice of life, in a good way. Sure there were fight scenes. Sure there were conspiracies. But our MC never gave a d*mn because his waifus >>>> everything. Screw them all, he would just curbstomped them through dungeon cheats. <<less
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Suijin rated it
November 7, 2018
Status: c63
It's not that bad, but the wish fulfillment is absurd on too many levels.

I read through it, but the second he decides to become an adventurer as a freaking dungeon owner.. Nope, go away. This is not worth it at this point.

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Custardmouse rated it
May 14, 2019
Status: c89
CardboardTL is in my top five list for all the translators I've read on NovelUpdates. Kudos for keeping the original linguistic flavor alive in relevant English slang. The story is really good, too! Manages to stay original and reverse some tropes in clever ways while landing solidly in the "My pace OP isekai" genre. Up to chapter 90, the action all seems to come to the door-step of a homebody MC, but that doesn't mean he's unwilling to visit the neighbors and lay down the law. If I have one... more>> complaint with this story it's that the game elements seem to have been dropped from the latter half of the chapters, in particular, the dungeon development aspects. When the author throws up their hands as if to declare, "this guy is too OP to track, I give up!" They've usually done something wrong. In this case, the stats of things haven't had much relevance to the plot of the story where conflict is infrequent, so it's not a deal breaker for me. However, part of the wish-fulfillment OP fun of stories like this has less to do with analyzing the numbers for verisimilitude and rating who the MC can throw down with and more to do with watching the numbers climb to silly levels and giggling about the absurdity of it all. In that respect, I hope the author comes back around to stat blocks soon. <<less
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Eisensturm rated it
September 17, 2018
Status: c55
I don't know how the author does it, but they make the story simultaneously interesting and mind-numbingly boring. The main issue of it is the protagonist. He's basically a high school reincarnator with a chuuni supervillain mentality who denies he has a chuuni supervillain mentality, and as a result often does s*upid things alongside brilliant things.

For example; he constantly insists he's not human in mentality any further, and can thus deal with certain things no self-respecting human would do, but then he gets cold feet with gore and the possibility... more>> of growing more non-human elements as he evolves. He's simultaneously lazy and hard-working, refusing to properly practice his skills but also properly taking care of his dungeon.

That being said, the slow-life aspect is fine. The lack of serious plot is fine. But the s*upidity of the protagonist at times is really grating, especially since he does show competence in regards to other important tasks. <<less
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PandoraTiger rated it
June 9, 2019
Status: c63
Not really recommended this novel,

It's just generic novel where the MC Reincarnated into another world as Dungeon Master (and Demon Lord), surrounded with Cute Girls (Dragon, Loli Vampire, Beastkin etc), as you expect, there is no single 'Guy' in his Harem World (All-Girls Squad).

-There is no World-Building, less character appeared, just plain slice-of-life where the MC Playing 'Happy Sugar Life' with their lovey-dovey girls.

-The MC itself is kind of sh*t, he kill all the knight who come to his territory without any doubt, without any regret. At this point I think I like this novel, but everything changed just in few chapter afterward. Later there is a Girl who called as a "Hero" come to his Territory, as you can expect from Harem-Isekai genre, yup the first Rule of Generic Harem-Isekai genre is "MC Will Never Let Any Girl Die, and Ofc Later She Will Join Into His Harem World", same as this novel.

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BhozzAoI rated it
May 25, 2019
Status: c199
i am now having a hard time continuing to read this novel even though it is a bit good as a slice-of-life novel because:

MC is a major pedophile. In the earlier chapter it isn't much but as the story goes on the pedophile tendencies of the MC is increasing that most chapters have words like: Illuna is so cute while doing this, Shii is so cute and so on so forth that destroys the pace of the story because of sudden s*upid lines such as those and it is done... more>> too much in later chapters that it is starting to get annoying and when it comes to introducing women the author basically just go like this "that woman is quite a hottie with a great body" just that and nothing has even been said of what the girl look like, the color of eyes or hair and how old she looks but when it comes to loli's the author truly put so much detail in saying many things and not only that in the next chapter the author will once again said what the loli looks like with so much emphasis.

Also the MC doesn't put much thought on getting stronger even though he has an enemy that he will eventually need to fight who is as strong or stronger than him and just laze around in his dungeon doing nothing and then he will just win against said opponent through PLOT ARMOR which is truly annoying. <<less
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TimeVoid rated it
June 6, 2019
Status: --
well, I gotta say that the novel were a disappointment. Based on what I read through many chapters, the MC is a dungeon master who is very much interacted to only 2 characters which are the elder dragon and loli vampire. While 3 chara were extras (the s*aves girls who become his maid and a fenrir). Do you know who was the most irritating ? The loli elder dragon. Yeah, that silver girl, her job is to eat and having boring activity. In a short chapters, MC fell in love... more>> with her and which even worst is that the loli vampire were in charge for controlling MC from approaching other women (this is getting into a wrong direction). Lastly, this is not a harem. Its a tr*sh harem.

Managing Dungeon? Forget it, Becoming an Adventurer ? Top priority, World building ?nah, too lazy. Enemies? Politicians. Monsters? To few.

1 star <<less
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Si Kucing
Si Kucing rated it
November 2, 2018
Status: c59
Well... it's bland... just ur usual reincarnation stuff, it basicly just like the title said.... don't expect much of it.... it's mostly slice of life stuff..... not that I hate it.... if there's something that put me off then that is :

... more>>MC didn't hesitate to commit a massacre, a bit of humanity still left in him, but all he did is issue a warning, once the warning is ignored he massacred them all without restrain... but the f*cking thing is... once the invader is a girl he hesitate like.... wtf?!!! He just scare her off... now that realy putting me off/spoiler]

All in all the title said it all.... what the story is about, n the character of the MC.... I would give it 1... but the slice of life's not bad so I raise it to 2..... n the potential (i realy hope I hit the mark) of MC and lefy's romance raise it to 3.... for now 3/5 <<less
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HentMas rated it
December 16, 2020
Status: c304
I mean... it's not perfect.

Let me put it this way, one of the biggest flaws most Japanese web novels/light novels have is that they seem to be missing an overarching goal or plot to move the story forward.

Most of the times this isn't an issue when you can see that the format is episodic with a plot that encompasses a couple of chapters and then meanders back onto slice of life tidbits that are interesting for characterization and character progression.

But I'm having a bit of trouble with this novel because... more>> it feels inconsistent and it's riddled with potential that the dear author kind of dismisses with the wave of a hand.

Several things are "hinted" at in the chapters that may or may not become important later, but it focuses on single episode plot devices that are done and over and really don't seem to connect with an overarching plot or theme or any kind of cohesive structure... (except with ONE character, and she isn't our MC)

So far, it feels like a kid that got a new toy, played with it for a couple of days, then got another toy and forgot about the first toy.

He's "the first demon lord that seems to be really sentient", he's "the king of dragons" he has "the blessing of the spirits" he's got "the hardest dungeon to conquer" and he simply doesn't have anything to do with all of this...
and doesn't seem to really care.

Don't get me wrong, the way he achieved all that was interesting and entertaining but in the end... pointless, because nothing haves substance or weight in the story.

It feels like playing Skyrim... you know, how you start with the idea "I'm gonna focus on Stealth!" or "two handed swordsman" or "pure illusion magic" and at the late game you become "Jack of all trades" "Leader of every guild" "Thane of all the provinces" "Archmage of the Mages guild"... and then you go and underwhelmingly kill Alduin by spamming "summon familiar" and "sneak attack"

That being said... everything else is fine, the characterizations are heartwarming and the effort the translator put into capturing the way the original story is supposed to sound (which is obvious a very strong cultural switch) is very well done, you don't really "notice" it, which is exactly how it should be done

no dude, he's not "inserting" words to make him sound a certain way, he's using his knowledge to make his character sound how he would sound if he was an English native

the story is so filled and riddled with JAPANESE pop culture references most of the humor would be GONE if the translator just focused to translating verbatim. <<less
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Arkazzy rated it
April 9, 2020
Status: --
I honestly find this to be one of the better rpg style isekais. The MC is not a complete idiot and his dynamic with Leficios is quite interesting as well. I enjoy slice of life novels in this genre, because overpowered Japanese simps becoming adventurers and collecting herbs whilst remaining eternal virgins isn't really my cup of tea. The fact that he has the strongest being in existence living alongside him basically tells us that he would never be in any real danger, which is both good and bad as... more>> we get to focus more on the mechanics and characters instead of constant battles like in Chinese novels, though it also means that no one ever attacks his dungeon which is a bit disappointing.

While I have a lot of good things to say, the negatives of this novel are way too glaring to not mention. Firstly is his personality, I like how is decisive and can kill his enemies, but sparing and reforming the hero just because she is a girl is s*upid and sexist. I also utterly despise the harem element, as it makes no sense in this scenario. He is married to the strongest being in the world (She can literally kill him with a sneeze), yet as Japanese authors like, she immediately becomes a submissive maiden in love who is actively encouraging him to get a harem, something the MC himself doesn't want. The existence of lolis is completely unnecessary and serves no purpose other than some low quality jokes every now and then. Furthermore, I dislike how the MC doesn't actually spend more time with the dragon to learn combat techniques, or explore the far reaches of the world, but instead runs around countries whilst solving their problems like a goody two-shoes pushover even though he really has no need since his territory is basically inviolable. Kingdoms go under change in leadership, get destroyed or become vassals all the time and Japanese MCs need to realize that everything is not just black and white where the invaders are evil and the defenders are good guys in need of saving. <<less
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Epythymy rated it
August 31, 2019
Status: c169
One of my favourite novels. For me it's almost perfect. I've had a really good time reading this. Maybe it's because the protagonist's character is somewhat similar to mine.

It's a relaxing story with a perfect isekai setting which allows you to enjoy life to the fullest.

MC isn't forced to do anything and is just going with the flow following his own wishes. Sometimes he is doing something for fun, sometimes just cause he wants to. There is no logic in some of his actions and there is no need to... more>> search for it or force your own onto him. MC isn't an idiot and he knows (mostly) the consequences of his choices.

There are some moments in which you would have done something the other way or chose a different path, but it's not really a minus for the plot, it just shows that everybody have different thoughts and points of view. <<less
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Anduin rated it
July 2, 2019
Status: c140
This is slice of life done right. It's not too slow paced. It manages to capture the daily lives of the main characters and remain interesting. There is combat, including some detailed battle scenes. The battle scenes are done well. There is plenty of adventure and exploration. There is a little bit of dungeon building, but not much time is spent on the details of it. Dungeon building is not the focus of this work.
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priest1drago rated it
June 1, 2020
Status: c281
I find this novel great because first, the translation quality is top-notch. Second, even though it’s a harem, the MC develops each relationship very deeply and not just picking up random damsels-in-distress. Third, the MC is not a conceited ass, and I think it’s really refreshing to read.

The slice-of-life elements can be felt really vividly amongst the humorous conversations and adventures. Give it a try!
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Zorlun rated it
February 1, 2020
Status: c208
Really pushed far for this one before reviewing, got to 208 chapters and I have really mixed feeling about this one. This is well written mostly, easy to read despite the numerous side chapters (arriving at 200 and you have more side chapters than "real" chapters after that).

Like I said, easy read, well enough written, quite cute and sweet, between adventure and slice of life. But the author is so f*cking sexist that it become really cringy and the harder to read as you keep going. The wrost is that... more>> it is really an insidious sexism, sweet and gentle, not violent, but still, in the end every female characters are robbed of their decisions, opinions and actions by the main character, and so with a big smile on everybody's face. This is way more dangerous than violent sexism in my eyes, because that way it can make you think that nothing is wrong here.

So easy read if you like slice of life, but quite the insidious sexist manifest. <<less
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Arha rated it
November 8, 2019
Status: c114
It's okay. The writing is weak and the dialogue too memey, but Lefi is pretty cute. The story keeps trying so hard to sell me on Illuna's cuteness and innocence that I'm half convinced that she's actually the big bad and using mind control because I don't find her cute at all and don't get what the characters see in her.

The world building is both really simplistic and can't seem to stay on the right note. Humans are all jerks... which is why we're siding with them anyway! Huh?

I'll probably... more>> get to the most recent chapter and then just stop reading unless something super interesting happens. The protagonist is pretty obnoxious so I'm not invested in his struggles. <<less
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phreakinsane rated it
July 27, 2020
Status: --
It started out really great, eventually the characters lack of development and his incessant immaturity combined with all the foul language and creepy loli collecting that started happening (literally started to collect grade-school loli's for romance... not my thing.) and the forced random marriage to a random side character... just too much was going wrong with this all at once and I ended up dropping it.

I really liked the start though so its not necessarily a waste of time to try out, I just couldn't continue reading it, hoping for... more>> better development of MC character and more mature story development. <<less
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LOTRfreak101 rated it
April 28, 2020
Status: c239
This is a great slice of life story with a bit of action thrown in. The characters all have great interactions with each other that get better as the story progresses. There aren't pointless fanservice scenes (or pretty much any fanservice scenes unless you have a wing fetish), so characters are developed as actual people instead of objects. The TL also does a great job of fulfilling the spirit of what the characters say, so while it may not be a perfect 1:1 TL, it brings the characters more to... more>> life and makes the story more compelling. <<less
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Minarett rated it
April 23, 2020
Status: c70
The main character in this story is absolutely unbearable. He's the type to think he's super cool for casting away his humanity. He unironically monologues about how he has become a 'True Villain' and demon lord. Basically he's a giant chuuni. It's like reading about those guys back in school who made edgy jokes and bought a katana with them to class. Also he seems to be sort of a psychopath. For a story with the tag heartwarming, the main character sure seems to commit a lot of cold blooded... more>> murder which could have quite easily been avoided if he put in a bit of effort. Basically he'll kill you unless you're an attractive enough girl. The localisation is a bit too much as well.

The story itself is pretty average, it's just the main character that drags it down. <<less
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Thousandswords rated it
January 31, 2020
Status: c208
Giving it a solid 3 star. The reason as follows:

It's a great novel as far as isekai novels with a slice of life tag can go. But, this particular novel has a weird problem. That is, the male protagonist (or the author) avoids the topic of s*x or mating in this case like a plague. The protagonist Yuki is unlike other beta JP protagonists we see in most novels, where they are too afraid to take the crucial step in their relationship and marry their harem members. Yuki did... more>> not wait for long and quickly married his harem members. But the problem starts from here, that is he entered a perpetual state of "Sage Mode". So far in the novel Yuki seems devoid of any carnal desire. He feels both attraction and love towards his wives, but so far he didn't show any feelings of lust for them. He doesn't have the male instinct of reproduction. Even when he is in the bath, alone with his beautiful naked wives; Yuki only has the feeling of attraction and love, no lust is present. It's the same for the female characters also. Some might say that Yuki is too innocent and pure, but we should remember that before his reincarnation he was an adult. He cannot be that much pure. In the end, there can be two possibilities:

Firstly, Yuki lacks a male reproductive organ. Secondly, the author himself is purposefully avoiding the topic for some reason. Maybe he has some sort of past trauma about the particular subject? Most likely we will never know, but Yuki is certainly the Beta Demon King adept in the art of the Sage Mode. <<less
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