Honatsu started going out with her childhood best friend, Toma. She feels happiness as he celebrates her birthday, but she loses the birthday gift from him. Shun, who helps her find it, can’t help but hold her close and tell her to be happy… That brings back her memories…?! Love triangle of a girl who lost her memories, her childhood best friend, and a transfer student. How will their romance turn out?! In this final volume, their past and secrets will be revealed!