Touya Senji grapples with his low self-esteem due to constant comparisons with his talented older brother. Even though he ranks in the top 100 of national mock exams, he feels he lacks true talent. He learns about the “Branch of Reincarnation”, an item that relives the abilities of previous lives. Soon, he met with Haito Luo Buffett, a returner who had already awakened her past-life power while fighting a serial killer.