Nineteen year old Itsuka Ren is amongst a group of Earthlings who call themselves "otherworlders", summoned to the World of Kai to be heroes, important political figures, and innovative thinkers. The only problem is... nobody recognizes Ren as such after he arrives a full year later than his peers.

Rebuked by the Magic Institute—and with no outstanding abilities—the juvenile delinquent and former middle school genius has spent weeks scrapping for every coin in an attempt just to stay alive in a new world.

When he's framed for a serious crime and facing execution, things look bleak for him, until he meets a mysterious time traveling woman who claims to know him from other timelines. As well as the fact that he may be the only chance to prevent a world-ending incursion by none other than... himself.