The Adventure of the Boy With a Mind of a Middle-aged Man


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Grey Millard was born as the third son of the poorest aristocrat in the empire. In the Millard territory of the empire lives its feudal lord, Grey’s father. However, his father is being controlled by his fiendish stepmother. Disliking this kind of trouble, Grey immediately determined to leave the Millard territory. Until Grey severs his relationship with his parents at 13, he devotes his entirety on self-improvement, ignoring those suffering under his stepmother’s tyrannical rule. But…

This is the adventure of a boy with the mind of a middle-aged man.

Associated Names
One entry per line
Karada Wa Jidou, Nakami Wa Ossan No Nariagari Boukenki
Related Series
Death March kara Hajimaru Isekai Kyusoukyoku (WN) (1)
Recommendation Lists
  2. sh*t to read
  3. Some fantasy sh*t ig
  4. BG/BL - Novel Kids are Important!
  5. Basically everything I read

Latest Release

Date Group Release
02/27/21 iNoveltranslation c33
02/24/21 iNoveltranslation interlude
02/20/21 iNoveltranslation v2c32
02/17/21 iNoveltranslation v2c31
02/13/21 iNoveltranslation v2c30
02/10/21 iNoveltranslation v2c29
02/06/21 iNoveltranslation v2c28
02/03/21 iNoveltranslation v2c27
01/30/21 iNoveltranslation v2c26
01/27/21 iNoveltranslation v2c25
01/25/21 iNoveltranslation v2c24
01/20/21 iNoveltranslation v2c23
01/16/21 iNoveltranslation v2c22
01/13/21 iNoveltranslation v2c21
01/09/21 iNoveltranslation v2c20
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14 Reviews sorted by

New DeadOpossum rated it
February 11, 2021
Status: v2c29
Every Japanese reincarnator must teach locals how to make a pump, soya sauce, and to say itadakimasu. A meteor shower is a must! This guy is no exception. Wait, he didn't make mayo and didn't bathe in hot springs with his harem! The princess didn't become his fiancee! On the other hand, the series is still going, so looking forward.

The author tries to be original by making the protagonist look like a mad scientist in a fantasy world. This does work to some extent, but still you have to disable... more>> some brain cells to not think about some absurdities.

The sudden flip in the middle of the first volume was refreshing. The guy turned from a careless noble kid into a ruthless killer, that was fun.

All in all, it is a usual reincarnation story. It is written and translated well (the sentences are making sense). <<less
1 Likes · Like Permalink | Report
New juntaksadis rated it
February 5, 2021
Status: v2c7
u will find the MC have contradictive trait. At this point he just become s*upid.
thestory just use the same plot againt and againt atleast ill give u 2 example


when zem got killed and s*upid sh*t happen and when he found the feces family torturing kid and the he got s*upid againt, I mean he is and old man that really despise people who cruel to children or woman, the goblin lord give it up. Anyway the world already full of shit. This sh*t just make it worst

2 Likes · Like Permalink | Report
DeirdreH rated it
June 7, 2020
Status: c14
Why do novels have to lie about their settings so much?

This is supposed to be the adventurers of a boy with the mind of a middle aged man, and yet:

... more>>

"I don't mind if it's you, Grey-sama, " Carla said cryptically before turning her back to me once again.

As I thought, the thought process of a child, and someone of the opposite gender, nonetheless, is a bit over my head.



"Carla, can you close your eyes for a bit?" I asked.


"Just close your eyes."

She stared at me for a while before her face quickly flushed.

"S-sure. I'll close them."

Her entire body was now as red as an apple and she raised her arms to her chest before meekly squeezing her eyes shut and pulling her chin in a little. I tilted my head in confusion at her weird behavior before teleporting her to Straheim.


Really? He's mentally middle aged and yet doesn't understand what that means?

Give me a break.

Edit: as of chapter 31 I'm deducting a star and probably dropping this novel. It's no longer reasonable to hope that this novel could remain as a solid three star or even improve.

Novels like this are already putting a heavy strain on the reader's suspension of disbelief in terms of what they make the main characters capable of, but as soon as an author introduces a character like Lilinor it's all over. Even though the author is self-conscious of what he is doing because he explicitly calls out how improbable the events of this chapter are, that's not enough to restore suspension of disbelief. <<less
27 Likes · Like Permalink | Report
pomoli rated it
May 31, 2020
Status: c7
It's almost ok, but it lacks interpersonal relations and complex characters worth following to be truly interesting.

I guess it's only beginning, but I really hope the story gets more complex, or it would be just that.


  • MC is an older person, and he acts calm and composed, as expected of his mental age.
  • I'm really curious on the lore about truly strong people around, as for now MC is overpowered.
  • The translation is very good, a rarity in the shitty world of amateur Japanese translations.

  • MC is way too unfazed in the first reincarnation/transmigration chapters, he just goes with the flow.
  • Other characters aren't really fleshed out.
  • No one asks about how the MC changed from a forgettable kid to an absolute genius.
  • MC knows stuff, but he's way too trustful,

    basically revealing everything about what he can do to a random merchant, who of course trusts him immediately.

  • In fact everyone is very "modern Japanese" like in the way they conduct business : everything is smooth, a promise is always respected, no jealousy about huge sums of money spent, no barter, etc.. This degree of trust is simply insane.
  • MC blends too well in his family/environment, while he basically has no memory about the person he replaced.
  • Like any Japanese isekai or transmigration story, MC HAS to recreate soy sauce. I don't get this obsession.
18 Likes · Like Permalink | Report
Arkazzy rated it
May 21, 2020
Status: c9
This is surprisingly unique and devoid of cliches. The MC is a genuine genius, not a psychopath but one that embodies the purpose of humanity as a race; To advance through the use of our collective knowledge. This novel acknowledges that the reason fantasy worlds are always stuck in middle ages is because magic is a shackle that blinds us to wonders of science and technology. The MC's entire goal in this novel isn't to build a harem, live a slow life, become the strongest or any other cliche garbage,... more>> he wants to completely change the system of the world

From the very beginning he has a sense of purpose and a goal you are genuinely want to see him achieve. He isn't a shitty, perverted salaryman with no self-esteem and lack of a reason for existence, which you would usually see in Japanese middle-aged men and it is like a breath of fresh air in this over-saturated genre. I am really excited to see where this novel will go and how the MC will singlehandedly uplift the human race in this barbaric world.

Only negative is that updates are inconsistent <<less
7 Likes · Like Permalink | Report
IsekaiMe rated it
September 3, 2020
Status: interlude
Chapter 39 changes everything!

The start of this all the way up to chapter 38 is kinda generic for a Japanese isekai/reincarnated type novel although I would rate it a little bit higher than the rest which is why I kept reading. I feel the MC is better than most as he knows that he's OP and has a plan in mind on how he wants to live in this world. However, the MC's actions in chapter 39 changes everything!

... more>>

He basically head stomps some pompous nobles and the "hero" for killing one of his subordinates. I'm talking full "damn the consequences, I'm just gonna unleash my anger" stomping. Did not expect it at all, and then his inner monologue expresses that he needs to change his world view and be more active in affecting the way things are in the current world he resides. Now this is what I'm looking for, an MC that's decisive and willing to use his power as he sees fit, good or bad.


Hoping this progression keeps it's direction and leads to more interesting things. Will update review depending on how things proceed from here. <<less
6 Likes · Like Permalink | Report
April 28, 2020
Status: --
This probably would be "LET TRAVEL AROUND THE WORLD!!!!!" but every time he get's somewhere there's problem he would put his nose into it and do something and. The end would probably still half of the continent unexplored MC: "Let's continue the traveling!!!!!!!" The end

This just my opinion I would still read it.... maybe..... if its good.
5 Likes · Like Permalink | Report
nightstick24 rated it
October 23, 2020
Status: c52

The story changes COMPLETELY past c39. Everything else is a prologue, the story doesn't begin until then. It goes from a regular old 3 star to 5 instantly. Won't spoil it, but it's one of the biggest change ups I've ever had the pleasure of reading, that changes the MC and the story to the very core.

For Madae's review, like mentioned above, c39 is where the story comes alive. It's written the way it is to make c39 all the more... more>> great. It's not a joke to say the previous 38 chapters exist solely to set up that moment.

For DeirdreH's review, the title is indeed 'The Adventure of the Boy With a Mind of a Middle-aged Man' but it's not referring to a normal person, which should be obvious. Nor does it say "from modern day Earth". Or even Human. The MC isn't normal at all, at the very least he's an insane mad scientist, we still don't know who he is at all, who's to say he has any experience with love? It's silly to think that he would simply because it says 'middle aged man'. In addition, it's a fantasy world, with skills and the like. Who's to say Lily doesn't have a special skill?

On Worldrefrain's review. Like above, it's never specified that he's a regular middle aged man from modern day Earth, or even human. His race actually definitely isn't Human in the prologue.

On pomoli's review, I'm a broken record here, but, the story starts at c39. Until then, everything is a setup for that moment, done very intentionally. As for the cons mentioned, broken record again, nowhere does it say the MC is a normal, Human, middle aged man from modern day Earth, the MC's attitude towards his reincarnation is exactly right for his personality. He's cold, and analyzing. Nothing matters other than his research. As for trusting people, he doesn't trust people, he just knows he has the ability to teleport to ANYWHERE within 3km, he can leave the instant anything goes sideways. As for his relations with his family, he doesn't have any to worry about upholding. His step mother and two of his older siblings don't treat him like a Human, the one sister that cares about him is away at school all the time, and when she's not she's just worrying about him, not interacting with him truly. As for his sudden change, it's explained why it's not totally surprising later, around chapter 30 I think. Also, as for everyone being very Japanese-like, keep reading some, that's intentional, and goes back to the mysterious chapter 39!

The novel isn't perfect, I'm not trying to say it is, but I truly recommend reading until at least c39, it's one of the most interesting and charged moments I've had the pleasure of reading. From writing standpoint it's executed so wonderfully it's amazing. Honestly, just thinking about how well crafted everything was for that single moment makes me incredibly excited for the future of the story. Absolutely worth a read, and the chapters leading up to c39 aren't bad by any means, they're just intentionally generic. <<less
4 Likes · Like Permalink | Report
Worldrefrain rated it
June 3, 2020
Status: c13
The adventures of a boy with the mind of a middle-aged super genius with photographic memory, like I mean come on man.
4 Likes · Like Permalink | Report
December 17, 2020
Status: interlude
The story starts fine, which is basically about a genius getting cheats and trying to profit through modern knowledge after reincarnated into a boy (it reminds me of the MC in the series I’m the Evil Lord of an Intergalactic Empire!). However the school arc (after c54) and the cliches of dense MC with harem make the series go downhill (though there's the same problem with Evil Lord). I mean, why do jp novels always write about prodigy going to school and repeat those cliches? It seems like c54 would... more>> be the cutoff chapter for those who want to stop reading the series after enjoying the excitements brought by the previous chapters. <<less
2 Likes · Like Permalink | Report
Togglingon rated it
October 29, 2020
Status: c53
I don't have the creativity to write as interesting and informative review as Nightstick24.

So incase you're wondering, chapter 39 is really the turning point of the novel. It's not the classic "Japanese" novel, at all. Worth a read, and I would recommend to read to atleast chapter 39, for the turning point, and if you want to see if it's truly good after that, read to chapter 53. Feels like that would be where "Volume 2" would end.

If you still can't decide, read Nightstick24's comment.
2 Likes · Like Permalink | Report
Madae rated it
August 3, 2020
Status: c30
At the beginning everything was fine, the story was interesting no stereotypes, it was good. But now, it falls into the usual and boring Japanese cliché....... I give up........ it's no longer interesting...... ML becomes more and more passive and without any character.
2 Likes · Like Permalink | Report
SirJho rated it
January 12, 2021
Status: c256
A fairly entertaining story if you are looking for an op protagonist, combining magic and modern knowledge.

We are talking about a protagonist who thinks beyond his superpowers.

For me the best arc is the Raldons liberation, that does not mean that there are boring parts like the entrance to the academy.

Highly recommended.
1 Likes · Like Permalink | Report
scribbledoutname rated it
December 2, 2020
Status: c53
Wavers between four stars and three, but it's four more often so that's what I'll rate it.

This is interesting :) A middle-aged man -- who turns out to be some sort of super genius, as far as we can tell -- dies and has his soul transferred into the body of a boy who's clearly just been murdered. The boy in this case happens to be Grey Millard, the mistreated son of a noble family led by a spineless man and his infuriatingly annoying wife.

Luckily, the MC accomplishes something supposedly... more>> impossible during his transmigration and is awarded with some cheats, including the ability to teleport around, see things within a range of 3km and combine ingredients to create grimoires that teach spells. The MC gets OP pretty quickly and then starts using his vast knowledge to pursue his ambitions (including getting filthy rich).

It's not an overly deep storyline but there are a couple of interesting mysteries and some enemies that can give the broken MC a run for his money. <<less
1 Likes · Like Permalink | Report
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