Breakthrough with the Forbidden Master


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“Compared to our time, the current generation just aren’t as reliable” they said, “Still, isn’t he the son of the Hero?” How annoying.

It’s been over ten years since the battle between mankind and the demons ended. The children of the heroes who saved the world are all grown up.
One of them, Earth, was a talented man, and everyone expected him to succeed his father as a warrior and defend his country, but Earth was always wary of his father’s title.

One day, Earth is shocked to find his father’s sword, which was used to overthrow the Demon King, sealed in his family’s mansion.
Because trapped within was the ghost of the Great Demon King who was unable to pass on and continued to roam the world.

For some reason, only he could see the spirit of the Demon King, and the Demon King possessed him through the sword.
Every day, forced to coexist with the spirit of the Demon King, they live a strange shared life, when the Demon King whispers to Earth on a whim.

“I have a grudge against your father. If you want to get back at your father and the world, I’ll train you. I’m free.”

Earth receives special personal guidance from the Demon King just to get back at his parents and the world.
Then, in the coming days. The hero’s parents, the heroes of the past, the first love, the princess childhood friend, the geniuses of the era, and the world will tremble.

Associated Names
One entry per line
A Breakthrough Came Out By Forbidden Master And Disciple
Breakthrough with the Forbidden Master – So what if the Hero’s son is the Demon King’s disciple~
Kindan Shitei de Breakthrough ~ Yuusha no Musuko ga Maou no Deshi de Nani ga Warui ~
Related Series
Ankoku Kishi Monogatari ~Yuusha wo Taosu Tameni Maou ni Shoukansaremashita~ (1)
I’m the Evil Lord of an Intergalactic Empire! (1)
Picked up a Demon King to be a Maid (1)
Recommendation Lists
  1. A light novel junky's fix
  2. Good JP (Isekai, Transmigration, Fluffy)
  3. Novels with Isekai vibe

Latest Release

Date Group Release
03/28/20 Sads Translates… c44
03/21/20 Sads Translates… v1 extra 2
03/21/20 Sads Translates… v1 extra 1
03/14/20 Sads Translates… c43
03/11/20 Sads Translates… c42
03/09/20 Sads Translates… c41
03/07/20 Sads Translates… c40
03/03/20 Sads Translates… c39
02/29/20 Sads Translates… c38
02/25/20 Sads Translates… c37
02/22/20 Sads Translates… c36
02/18/20 Sads Translates… c35
02/15/20 Sads Translates… c34
02/12/20 Sads Translates… c33
02/08/20 Sads Translates… c32
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11 Reviews sorted by

March 19, 2020
Status: c43
Looks like that the protagonist is having family problems. Really wish that the protagonist, son of hero would soon completely fall to the dark side and start kicking a****

It might be even better if the master within the protagonist is actually slowly manipulating him like some two-faced intergalactic emperor, with teachings like Let the hate flow through him... ^_^ ^_^ ^_^ ^_^ ^_^

Anyway, it is an interesting novel featuring personal struggles and a bit of romance for the protagonist born in a prestigious hero family who neglects parenting.... more>> Looking forward to more twists in the later adventure chapters. <<less
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New Funggen rated it
March 14, 2020
Status: prologue
Novel with great MC. I never knew a teacher and student relationship could be this exciting.

I am happy that it doesn't following the temp. But, those naming sense lol..
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AsuraEND rated it
December 6, 2019
Status: c225
Dense Protagonist? I don't think he's dense at all, it more like he thinks the princess actually hates him, and for a good reason to. The chick takes tsundere to the extreme. I mean if someone spreads rumors that I'm a pervert just so I don't get a girlfriend I'd think that the chick hates me.

Hell he doesn't even know that they're gonna get engaged while the princess does know.

... more>> Edit:

Rather than calling him dense, I think emotionally repressed would work better. He's never truly had any meaningful role models other than Sadiz. And we all know that he genuinely loves her, she's practically raised him and has been his number 1 supporter. Earth's mother was never around and his father only criticizes him and compares him with the other children. In all honesty the author did a really good job making me genuinely dislike Earth's parents and his Princess fiancé. <<less
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OmnisNihil rated it
November 27, 2019
Status: c10
Translator-san, author-san, you better not drop this >: (

Alright. We got a decent MC. He's not the most likeable, not the least likeable. He's just a regular person. Being pissed, by regular people reasons. Yeah. I also like that he's not an omniscient and omnipotent guy. He's a little bit dense, but it's kind of justified imo. And btw, he's not going to be doing the against the whole world thing like in the synopsis.

Alright, I'm not sure where I'm going. But I know this read isn't worth only 3.9... more>> stars. Might be, for the people who want to read power level shit, but. Yeah, if you want to read a less empty feeling novel where the story isn't really focused on beating up people but rather the relations, here. <<less
5 Likes · Like Permalink | Report
Light novel junkie
Light novel junkie rated it
February 18, 2020
Status: --
I'm loving this. Now that that's out of the way here's why :

Main character isn't another naruto/kirito. No deus ex machina power of friendship bs power up. He's actually putting in effort to get to his goal.

MC is more relatable as a person. Not another npc esque MC who when mocked and ridiculed just takes it with a grin and wins those who mocked them over because never give up.

The characters. Really only ones I actually like are earth, the demon ming and sadiz. I literally want MC to verbally... more>> decimate his parents and that tsundere to the extreme princess in the most epic of ways. It literally raises my heart rate thinking each chapter brings us that much closer to that. <<less
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Animeninja808 rated it
November 7, 2019
Status: c4
Really love stories like this, MC is angry, hateful, underestimated but then gets help from humanities greatest enemy who doesn’t like a story like that.
3 Likes · Like Permalink | Report
December 11, 2019
Status: c200
I really like first arc (Worst day of his life) so I read ahead use mtl until I reached lastest raw chapter at moment (prologue+199chapters)

So in short..... this demon king, true to his name actually bodybuilder.... and 90% of training is just muscle training /facepalm in 200 chapters he only learned 5 combat magic (breakthrough/demon spiral/magical breathing/generic earth magic to solidify wet ground/Giga drill breaker) and story is really like generic shonen+sport manga (mostly in second tournament arc)

Interaction between earth and trainer is somewhat enjoyable though and harem....... more>> /sigh let's just say he running always from most of them until later arc (there're 4 righ now but since xxx gender is.... i'll use author's words "I will leave it to each individual decision" so maybe it's 5)

So, in conclusion I expect it to be sword/magic novel and disappointed but will still give it 4 star for Giga drill breaker some peak moments and first arc. <<less
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HamsterOverlord-sama rated it
November 30, 2019
Status: c11 part1
1. It's a cliche story with a school Boi MC who has daddy issues and average rebellious teen problems. And it possibly has harem elements.

While I usually despise such stories, this one makes MC, at least at the time of my reading it, much more human and much more relatable. One can actually invest into his character and feel bad or sorry or embarrassed for him. His problems feel real and relatable. I like it. The rest of the cast - pretty meh, honestly. The demon king character is somewhat... more>> unfleshed-out.

But overall the story so far is light and enjoyable. It won't have much depth, possibly the quality will go downhill but I at least hold some expectations. That's why I rate it with the generous 4-star score <<less
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mustafajennings rated it
January 6, 2020
Status: c60
The story is great, it's really a breath of fresh air compared to similar novels. It takes roads other novels wouldn't.

Almost everything that happens in this book happens for a good, justified reason. The author likes to foreshadow things, and every chapter has a reference or two: ... more>>

the MC's last name is Lagann and his best technique so far is a magical drill. Also one of the ninja techniques is literally called "Uzumaki Naruto"


Rather than being able to see what will happen in this book by using your experience of other books, you use your experience of real life. You can see that almost without thinking the MC will do something potentially life-changing in the future; then, when there are actual consequences, all you can say is "WHAT THE HELL DID YOU THINK WAS GOING TO HAPPEN!?"

This book makes use of some tropes (not including reincarnation) simply as a way to help reader understanding rather than to make a cardboard cut-out story. <<less
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Draggador rated it
January 2, 2020
Status: c63
There are things in the story which could be annoying for some, like the naming sense of the author but overall, it's interesting (at least where I'm). I read using a JP dictionary & machine translation & it's fine so far. If you want to see a protagonist who ends up having a falling out with everyone on the "good side", then maybe you'll like the story.

Poor Aka-san.. I feel realy bad for him. F***ing humans. (TT_TT)
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Redmi rated it
January 30, 2020
Status: c218
This is another novel that taught me to not judge a novel by its title. I have seen this novel around for quite some time in novelupdates' index but I ignored it because the title reads like a ghey CN novel from jjwxc. One day, my finger sleepily slipped and I touched the hyperlink for this novel. Only then I found out that this novel is a JP novel. Seeing that there is no yaoi tag there, I started to read this to see if this novel will get into... more>> my 'recommendation' list or not.

Voila, I am so impressed with what I have seen from what has been translated, I decided to continue reading the raws, for 4 consecutive arcs.


This whole novel is pretty much a Tengen Toppa Gurren Lagann fanfic. The fact that it gets a novelization without being sued to the hell and back is a mystery by itself.

The first arc (tournament arc) is great, second arc (the first best friend arc) is meh (the only good thing in it is the MC met his DFC Princess Nia waifu) and the third arc (where MC met with a guy similar to the dragon guy from Demon King, Retry novel) is just a little bit better. The fourth arc (another tournament arc) is just as good as the first one, which greatly redeem the series back. And from what I have read for the fifth arc as of now, it should be better than 2nd and 3rd arcs, but not as good as the 4th or 1st ones.

Conclusion: Novel needs more tournament arcs?


⭐⭐⭐ from me as of now.

edit: As of latest chapter 218...


The fifth arc turns out better than expected. It is not good as the preceding 4th arc but is vastly better than the 2nd and 3rd arcs. This novel could have been much better if the author doesn't make the 3rd arc as bad as it is now. Maybe a rewriting is in order for the 3th volume of the light novel?

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