Haruto lived his life with the goal of reuniting with his childhood love, only to be dually thwarted by her sudden disappearance in high school and his own death in a bus crash at age twenty. The next thing he's aware of is waking up in a freezing cold room in the slums of another world – at age seven. It seems that after his death Haruto was reborn as Rio, an immigrant child in a fantasy kingdom, and now with the knowledge from his former life, Rio is about to enter into an entirely new phase of life.