Hell's Paradise: Jigokuraku

is a Japanese manga series written and illustrated by KAKU Yuuji that was serialized on Shueisha's online Shōnen Jump+ site from January 22, 2018 to January 25, 2021 and resulted in 13 tankōbon volumes. On December 17, 2021, and anime adaptation by MAPPA was announced at the Jump Festa '22 with a new teaser trailer and visual. On November 19, 2022, Crunchyroll announced at Anime NYC 2022 that it will stream the anime when it premieres in Japan.

Plot
Gabimaru the Empty, a former ninja assassin known feared as a heartless husk of a man, spends his days on death row wondering when an executioner skilled enough to so much as harm him will arrive, as he thinks nothing of seeing an end to his meaningless existence... Or so he thought. Then the lady executioner, Asaemon the Beheader, rekindles his hope with an astounding proposition. If he ever wishes to see his beloved wife again, he is, under the auspices of the shogunate, to embark on a perilous voyage to the mysterious mystic island said to house the elixir of immortality. Should he be the one among many rival death-row fiends and scoundrels to find the elixir, he'll earn a full exoneration, and, more importantly, a chance at an ordinary married life with the light of his life--the woman who made the world seem not so ugly. What awaits them is a journey like no other!