Full title: 無職転生 〜異世界行ったら本気だす〜 (Mushoku Tensei: Isekai Ittara Honki Dasu, lit. Jobless Reincarnation: I Will Seriously Try If I Go to Another World).
An isekai light novel series about a jobless and hopeless man who reincarnates in a fantasy world while keeping his memories, determined to live his new life without regrets. Illustrated by Shirotaka.
A manga adaptation began serialization in June 2014. An anime adaptation premiered in January 2021.