Mako Fujiyama is a seemingly normal high school girl, but she has a strange hobby: she loves to peep at girls' butts and masturbate every morning before school. One day she meets Risa, a perverted exhibitionist. Mako's life takes a turn for the better when Risa invites her for a closer look...

Included one-shot: Himitsu no Zettai Ryouiki