Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru

The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

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Alternative Titles

Synonyms: The world's best assassin, To reincarnate in a different world aristocrat, Ansatsu Kizoku
Japanese: 世界最高の暗殺者、異世界貴族に転生する
English: The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat
More titles


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Oct 6, 2021 to Dec 22, 2021
Premiered: Fall 2021
Broadcast: Wednesdays at 23:00 (JST)
Licensors: None found, add some
Source: Light novel
Genres: ActionAction, DramaDrama, FantasyFantasy, MysteryMystery, RomanceRomance
Themes: IsekaiIsekai, ReincarnationReincarnation
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.371 (scored by 232329232,329 users)
1 indicates a weighted score.
Ranked: #21892
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #463
Members: 416,230
Favorites: 3,745

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Ranked #2189Popularity #463Members 416,230
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The world's greatest assassin had sworn lifelong allegiance to the organization that raised him. However, despite his loyalty, that very same organization takes action to silence him, ultimately leading to his demise. Drowning in frustration and regrets he can no longer suppress, he finds himself in an audience with a goddess attracted by his exceptional skills. The goddess offers him reincarnation into a magnificent world of swords and magic so he can perform a crucial mission: prevent that world's destruction by slaying its hero.

Accepting the goddess' request, he is reborn as Lugh Tuatha Dé, the son of a noble family of assassins serving the Alvan Kingdom. Under the guidance of his father, Lugh learns new assassination techniques that significantly differ from the cold-blooded and unsympathetic killing style of his previous life. Furthermore, his other talents bloom, allowing him to meet new allies and acquaintances. Even so, Lugh knows that his efforts are far from adequate, because a monumental adversary such as the hero can only be defeated with perfection.

[Written by MAL Rewrite]


Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru adapts the first volume of Rui Tsukiyo's light novel series of the same title.

Episode Videos

Related Anime

Characters & Voice Actors


Takahashi, Chiaki


Momosuzu, Nene

Liannenon, Epona


Tuatha Dé, Cian

Morikawa, Toshiyuki


Matsukawa, Hiroki


Tamura, Masafumi
Hosoda, Masahiro
Episode Director, Storyboard
Takayama, Katsuhiko
Script, Series Composition
Yuuki, Aira
Theme Song Performance


Opening Theme

Apple Music
Amazon Music
Youtube Music
"Dark seeks light" by Yui Ninomiya

Ending Theme

"A Promise" by Aira Yuuki (結城アイラ)

Dec 22, 2021

Somewhere between the release of .Hack and the year of 2013 the isekai genre devolved into a downwards spiral of recycled ideas being vomited out by any studio looking to make a quick buck. The World’s Finest Assassin tries to break free from this cycle, spicing up the genre by making the protagonist a world-class assassin instead of a loser otaku. If that isn’t enough to satisfy you, he’s also an anti-hero with the mission of bringing down the hero of the world. Apparently, any slight change to an isekai is enough to get an A+ for originality from the anime community.

You ...
Dec 22, 2021
When an author proclaims that one of their works is the best/finest that they have ever written, you'd better take them at their word seriously. It's especially more so from one that has created one of the most controversial works adapted into anime, rightsmack at the beginning of the year: Redo of Healer. That's right, Rui Tsukiyo is once again back on the anime scene, and this Isekai Assassin work that this chill furry dude has so thoroughly written, is indeed no pushover. It's something that feels a lot more like your traditional decent Isekai reincarnation story, with a premise that makes it kinda impressive ...
Dec 22, 2021

The World’s Finest Assassin Gets Reincarnated into Another World as an Aristocrat is an isekai that’s centered around an old, about-to-be-retired assassin who gets himself killed by the very “organization” he was loyal to during his final mission. Just before he was destined to die, he was reincarnated and placed in front of a god, which the entity tasked him to slay the hero of her realm. As it’s said by the entity herself, if the hero wasn’t slain, the hero would bring destruction and annihilation upon the world in which he saved.

Well, that would have been the plot of the ...

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