Isekai Maou to Shoukan Shoujo no Dorei Majutsu

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Alternative Titles

Synonyms: The King of Darkness Another World Story: Slave Magic

Japanese: 異世界魔王と召喚少女の奴隷魔術

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Information

Type: Manga

Volumes: Unknown

Chapters: Unknown

Status: Publishing

Published: Jun 24, 2015 to ?

Genres: Action, Comedy, Fantasy, Romance, Ecchi

Themes: Harem, Isekai

Serialization: Suiyoubi no Sirius

Authors: Murasaki, Yukiya (Story), Fukuda, Naoto (Art)

Statistics

Score: 6.95¹ (scored by 10,021 users)

¹ indicates a weighted score.

Ranked: #10232²

² based on the top manga page. Please note that 'R18+' titles are excluded.

Popularity: #576

Members: 35,011

Favorites: 198

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6.95

Ranked #10232Popularity #576Members 35,011

MangaSuiyoubi no SiriusMurasaki, Yukiya (Story), Fukuda, Naoto (Art)

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Synopsis

An elite but socially-stunted gamer finds himself in another world, inhabiting the body of his character Diablo. Despite his powers, his awkwardness keeps getting in the way, so he decides to pretend to be a Demon Lord and soon finds himself with a pair of slaves: a well-endowed elf and a cat girl. Together, they struggle with everything from interpersonal relationships to diabolical beast battles.

(Source: Seven Seas Entertainment)

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Background

Isekai Maou to Shoukan Shoujo no Dorei Majutsu has been published in English as How NOT to Summon a Demon Lord by Seven Seas Entertainment since June 26, 2018. The series has also been simulpub by Kodansha USA through K Manga.

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Characters

Diablo

Main

Galleu, Rem

Main

L. Greenwood, Shera

Main

Sylvie

Supporting

Edelgard

Supporting

Rose

Supporting

Weselia, Lumachina

Supporting

Bichelberger, Emile

Supporting

Cristela, Alicia

Supporting

Medios

Supporting

Reviews

Jan 24, 2026

Ultron-Sigma

Recommended

Preliminary (129/? eps)

"Isekai Maou to Shoukan Shoujo no Dorei Majutsu" AKA "How NOT to Summon a Demon Lord" is one of many among the "power fantasy isekai trend" of its time. However, unlike many of its peers, How NOT to Summon a Demon Lord managed to get 2 anime seasons and a monthly manga that's still ongoing since 2015.

'Diablo' is the name of the avatar that the socially awkward main protagonist: Sakamoto Takuma (never ever used again), uses in the fantasy MMO 'Cross Reverie'. He refers to himself as the "true" Demon Lord and using the most powerful items he collected and huge knowledge of the game, ... he destroys everyone who challenges him and his dungeon.

As is tradition of various isekai, he goes to sleep and suddenly wakes up in another world. A world that seemingly matches the game with a body that looks exactly as his game character: Diablo. Pretty typical for gamer isekai protagonists, he has a hard time talking to other people without role-playing his character. Which gets him into shenanigans and misunderstandings but also lets him bluff and get around other unwanted situations as well.

He meets the other 2 heroine protagonists almost immediately as it's revealed Diablo was summoned through a summoning spell meant for summoners to obtain creatures through an enslavement ritual. The 2 heroines are: Shera Greenwood, a big-breasted, ditzy Elf and Rem Galleu, a somewhat quiet but logical catgirl. They attempted the enslavement ritual on Diablo thinking he's a uniquely powerful summon but the ritual got reflected back at them due to Diablo's magic ring. As per isekai tradition, they are now Diablo's slaves, which is mentioned a few times in the beginning but quickly gets glossed over and nothing too perverted really happens because of the slave collars or "master-slave commands".

Ok now that I got the summary out of the way... is it worth reading? Honestly, yeah. As with many monthly manga, it starts off slow as it needs to setup many of its characters, the main plot, and subplots. I even almost dropped this manga myself multiple times but I kept coming back somehow cause I wanna see what Diablo gets up to next.

Despite Diablo being your usual typical power fantasy isekai protagonist, he's not outright invincible or all that overpowered. After the usual trope of showing off how powerful the protagonist is he quickly finds "high-level" people who rivals and even matches his strength and powers who constantly put him on the ropes which he often comes out on top using a combination of tricks, bluffs, various magics, various gear, and knowledge of the video game where applicable. Diablo as a game character is at a max level of 150 and is classed as an elemental mage. However in the isekai world, there is no max level (as far as I know) and you're not limited to being locked into a single "class" which Diablo eventually puts two-and-two together which he then sets out to become even stronger than his game character (later in the story anyways).

In short, I really enjoy seeing the "overpowered" protagonist struggle in fights and having to put in considerable effort in beating his enemies.

Diablo gets caught up in the never-ending battle between "People of the races" (Humans, Elves, animal people, humanoid demons, etc.) and the Fallen (which are like a mix of monstrous beasts and demons) as the Fallen are trying to resurrect their Demon Lord. Not only that, he also gets caught up in the political struggle and conspiracies between the Church and the Kingdom and the various people who are trying to gain the upper hand against one another. It's a surprising amount of political intrigue although it's still not enough to say it's significant, just enough to keep the plot moving forward.

The art is mostly good, some weird proportions here and there but you get the gist of what's going on. There's definitely fan-service as there's a handful of ecchi scenes and scenarios but honestly the author rarely goes anywhere with it and at most it's just implied 'service' actions. If you're expecting a ton of ecchi then you'll probably be disappointed.

The only real gripes I have with this manga is the fact that it feels held back by being a monthly manga as there are some arcs and months where it drags out and would benefit from faster pacing offered by weekly releases. There's also the fact that Diablo is basically really the only one that solves everyone's problems, at least where fighting is concerned.

In terms of popularity I feel like "How NOT to Summon a Demon Lord" has already long since hit its peak (especially after the mediocre Season 2 adaptation) and will likely not garner any major attention in the near future.

Either way, here's hoping that "How NOT to Summon a Demon Lord" continues its releases and maintains a consistent fanbase.

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Mar 9, 2021

Josh_Bong

Recommended

Preliminary (65/? eps)

How NOT to Summon a Demon Lord, or as I like to call it, Harem King From Another World is your standard ecchi/harem isekai with an overpowered mc.

PLOT

One day the main character is suddenly summoned into a fantasy-type world as a slave to a pair of adventures. During the summoning process, something goes wrong and the roles of master and servant are reversed leaving the newly summoned protagonist with a catgirl loli and big tiddy elf as slaves. The world is extremely similar to a game the protagonist played in his world, hence when he is summoned not only does his appearance change, but ...

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Mar 11, 2018

Worst_Red

Mixed Feelings

Preliminary (55/? eps)

Should I start this manga? Do you like Echii and I'm not talking soft-core stuff, there are sections of this manga that could just be classified as hentai. If you can live with that, and the story getting slower and slower then yes you should pick it up if you like Isekai with a strong harem driven, OP MC.

-Moderate Spoilers- (If you don't want a quick plot overview skip down to the pros and cons)

The story hits it off with MC-kun being Summoned to another world by two adventurers who wished for a powerful familiar but in-fact had the spell reversed on them making them ...

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Poll: Isekai Maou to Shoukan Shoujo no Dorei Majutsu Chapter 124 Discussion Yubisoft - Jul 25, 2025	3 replies	by Yubisoft »» Oct 15, 2025 10:05 AM
Poll: Isekai Maou to Shoukan Shoujo no Dorei Majutsu Chapter 92 Discussion rocketpuppys - Jan 11, 2023	0 replies	by rocketpuppys »» Jan 11, 2023 11:03 AM
Finished S1 of the anime, what ch should i start on? 2WENTY1 - Apr 1, 2021	1 replies	by Dark_MagiShawn »» Apr 2, 2021 8:00 AM
Poll: Isekai Maou to Shoukan Shoujo no Dorei Majutsu Chapter 41 Discussion jh_on_y - May 5, 2019	1 replies	by Slimbo101 »» Mar 23, 2021 12:11 AM
Poll: Isekai Maou to Shoukan Shoujo no Dorei Majutsu Chapter 30 Discussion Stark700 - May 7, 2018	2 replies	by Slimbo101 »» Mar 12, 2021 6:43 AM

Isekai Maou to Shoukan Shoujo no Dorei Majutsu
How NOT to Summon a Demon Lord
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Isekai Maou to Shoukan Shoujo no Dorei Majutsu
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