Puberty syndrome – a mysterious phenomenon rumored to occur only in precarious and unstable adolescence. For example, it is a wild bunny girl that appeared in front of Azusagawa Sakita. Her true identity was Miyako Sakurajima, an actress who was a high school senior student and was inactive. The enchanting figure of her does not appear in the eyes of the surrounding people for some reason. Sakita who set out to solve the mystery, knowing her secret feelings in time spent with Mai, … heroines who have “adolescent syndrome” appearing one after the other around Sakita . In the city where the sky and the sea shine, a mysterious story begins to start.