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

A legendary contract killer from our world dies and gets a second life as the eldest son of an aristocratic family in a fantasy realm. A goddess grants him reincarnation with one cold condition, he has to assassinate a prophesied hero said to bring about the world's end. He brings with him modern tradecraft, murder techniques, and tactical thinking, then pairs that with the household secrets, magic, and nobility training of his new family. The series follows his methodical, often clinical approach as he trains, plans, and carries out missions, while the surrounding politics, loyalties, and moral questions complicate the path the goddess set for him.

Released in 2021, the anime is based on the light novel by Rui Tsukiyo and adapted for television by creator Katsuhiko Takayama, featuring Kenji Akabane as the lead voice, with Reina Ueda, Yuuki Takada, Shino Shimoji, and Toshiyuki Morikawa rounding out the main cast.

Critics and viewers tended to respond well to the show, reflected in an 8.1/10 average from audience ratings. Reviewers highlighted its blend of tactical action, dark humor, and the antihero lead, while some noted pacing issues and familiar isekai beats. Major themes include duty versus personal code, the ethics of preemptive violence, and how modern knowledge alters a fantasy power balance.

The series struck a chord with isekai and action fans, sparking online discussion about antihero protagonists and assassination logistics in fantasy settings. Cosplay, fan art, and scene breakdowns circulated among communities that enjoy morally gray leads, and the show often appears in conversations about genre entries that mix modern techniques with magic.

It didn’t collect major industry awards, but it maintained steady popularity among its target audience and helped raise the profile of Rui Tsukiyo’s works in animated form, securing a reliable fanbase for possible future adaptations or seasons.