Hinata is murdered again by the Tokyo Manjikai Gang in front of Takemichi. In order to save Hinata, Takemichi travels 10 years back in time again. Takemichi has to change a key case that can save Hinata. The key case involves a sad incident that occurred to 6 men, who later formed the Tokyo Manjikai Gang.

An unemployed man learns that his ex-girlfriend was murdered. He suddenly finds himself travelling through time to his middle school years and has chance to change the future and save the girl. He aims to rise to the top of the most brutal delinquent gang.

This is Kamikai

In the spring of a new semester, a "ranking" is sent to Class 2-D. It clearly shows the rankings of all the students and the homeroom teacher. The one who ranks 1st is Himeyama Tsubaki, a kind and popular honor student recognized by everyone. But one day, without any warning, she commits suicide. A few days later, everyone in the class receives a suicide note from Himeyama, and from that day on, the class begins to fall apart.

A gaming-obsessed teen must reignite romance energy for a fading magic realm by dating within a month. Forced into proximity with three charming suitors, will she dodge love's chaos—or embrace unexpected heartbeats to reclaim her mundane life?