Fukushuu Kansuisha no Jinsei Nishuume Isekaitan
復讐完遂者の人生二周目異世界譚
Kurono Kousuke has completed his quest for vengeance against the person who killed his sister. With no further purpose, he ends his life but awakens in a different world accessible only to those with painful histories. Initially puzzled, he soon considers the possibility that his sister may have also been brought to this realm. Driven by uncertainty and hope, he begins searching for her.