Isekai Fukushuu: Ore wo Ijimeta Yatsura wo Saikyou Skill de Shihai suru

Synopsis

Tanizawa, a bullied kid who was sent into another world, was working at a slave inspection center, putting “a certain skill” to good use. Surrounded by kind people, Tanizawa was living a much better life than he had before, when one day, Reina Kikuma—a classmate who used to bully him—arrived at the inspection center as a “slave”…!? Use his ultimate skill to exact revenge on those hated bullies!!