Isekai Tensei de Kenja ni Natte Boukensha Seikatsu: "Mahou Kairyou" de Isekai Saikyou

Description

After his tragic death, Minato was reborn in a world where Offensive Magic has not been banned. He was thrilled to see that Offensive Magic for the first time, however he couldn’t help but wonder why all the magic circles are so inefficient?! After witnessing how ineffective the magic in this new world is, he decides to use knowledge from his previous, far more advanced world to improve it. Come along on Minato’s quest to improve the magic of his new home!

Source: Manga UP! Global

Type

Manga

Related Series

N/A

Associated Names

Isekai Tensei de Kenja ni Natte Boukensha Seikatsu

Isekai Tensei de Kenja ni Natte Boukensha Seikatsu - "Mahou Kairyou" de Isekai Saikyou

Isekai Tensei de Kenja ni Natte Boukensha Seikatsu - [Mahou Kairyou] de Isekai Saikyou

Isekai Tensei de Kenja ni Natte Boukensha Seikatsu: [Mahou Kairyou] de Isekai Saikyou

My Adventurer Life: I Became the Strongest Magic-Refining Sage in a New World

Я стал мудрецом, перевоплотившись в другом мире, чтобы жить как авантюрист и стать сильнейшим в мире

ชีวิตนักผจญภัยของปราชญ์ผู้เริ่มใหม่ในต่างโลก สุดแกร่งด้วยสกิล ปรับแต่งเวท

異世界転生で賢者になって冒険者生活　～【魔法改良】で異世界最強～

이세계 전생으로 현자가 되어 모험자 생활 ~ [마법개량]으로 이세계 최강~

Groups Scanlating

KS Group

Latest Release(s)

c.21a by KS Group 11 months ago

c.19-20 by KS Group 2 years ago

c.18 by KS Group 3 years ago

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Status in Country of Origin

11 Volumes (Ongoing)

Completely Scanlated?

Anime Start/End Chapter

N/A

User Reviews

N/A

Forum

0 topics, 0 posts

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User Rating

Average: 6.8 / 10.0 (54 votes)

Bayesian Average: 6.61 / 10.0

13%

24%

15%

17%

11%

Last Updated

January 6th, 2026 3:09pm PST - 3 days ago

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Genre

Action Adventure Comedy Ecchi Fantasy Sci-fi
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Categories

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Category Recommendations

Isekai no Binbou Nouka ni Tensei Shita Node, Renga wo Tsukutte Shiro wo Tateru Koto ni Shimashita

Secretly More Powerful Than the Hero

Akumade Taidana Akuyaku Kizoku

Shenwu Tianzun

The Sweet Life of a Reincarnation Pro

Recommendations

N/A

Author(s)

SHINKOU Shotou

Artist(s)

KANNA Yuyu

Year

2020

Original Publisher

Square Enix

Serialized In (magazine)

Manga Up! (Square Enix)

Licensed (in English)

Yes

English Publisher

Manga UP! Global (41 Chapters; Ongoing)

Activity Stats (vs. other series)

Weekly Pos #487 (-259)

Monthly Pos #1158 (-600)

3 Month Pos #2642 (-370)

6 Month Pos #3603 (-163)

Year Pos #4110 (-197)

List Stats

On 690 reading lists

On 111 wish lists

On 5 completed lists

On 14 unfinished lists

On 115 custom lists

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User Comments [ Order by usefulness ]

Decent but the Numbers Don't Add Up

by LazyReviewer
3 years ago

Rating: 5.5 / 10.0

The art is pleasant enough and the main supporting characters have a personality that's more than one dimension, but the MC is yet another victim of Isekai authors selectively making characters lose their common sense and act like an imbecile for no reason other than artificial plot drama.

But when I say the numbers don't add up, I mean that literally. The MC was reduced to 20% of his mana, then cast a huge spell and is still at 20%, which just happens to be the perfect amount of time needed to deal with the problem at hand.

This was after spending 80% on a single spell... which was preceeded by slinging expensive spells en masse. He had to have started with 140% at least, but that's just what the numbers add up to, not what the manga claims.

The manga makes a big deal about the amount of mana that's available, but then completely disregards it whenever the plot needs an extension. Like, when there's 6 hours to rest and regain mana and become more useful—and remember, he's the smart colleague who knows how to keep his magic research colleagues on track as is pointed out a few times already—he decides to do everything in his power to stay up and spend that 20%. And now we have a plot where the 20% (which has been unnecessarily powering a big spell at seemingly no cost despite the story telling us it's a big cost) must hold up for 2 days.

Oh, and only now does it occur to the magic researcher that the spell might disappear once he falls asleep despite not sleeping for 2 days already.

Are you flipping (a table) serious?

Just a little bit of planning and logic would prevent silly, stupid stuff like this.

There was a golem that the MC, who has used magic all his life and studied it as a career, one-shots. But the author chooses to make the MC suddenly deaf and cast 20 more... but this is done without the goofy/exaggerated faces that should accompany a comedic scene, and there's an emphasis on amount of mana used overall, so the scene becomes completely tone deaf and breaks my immersion.

With that said, the world is interesting, there is some care taken to prevent total break of suspension of disbelief, and there's a potential here that will keep me coming back for at least a few more chapters (I've read Ch. 12) to see whether the author gets it together or loses the rest of it.

Edit: The author is willing to force a story beat regardless of whether there is logic to it. In the most recent example (chapter 20) the MC gets a new item, but that item drains him of mana. He blames it on a lack of sleep, saying he's been up for two days, when in reality it had been 3 days since he had free time with no pressure to do anything and no threat, so he's actually been sleeping soundly each night.

It's like the author tries to be consistent, but when they write themselves into a corner, they prefer to ignore what was previously written instead of doing it right for whatever reason.

... Last updated 1 year ago

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