High school student Takumi Kusuki works as a wood seller in a remote village. One day, he is visited by Satsuki Satonaka, his tomboyish childhood friend who used to excel at basketball. When an accident cut short her ambitions, Kusuki was the one who rescued Satsuki, earning him lifelong gratitude from her and her family. After discovering Kusuki's collection of porn magazines, Satsuki teases him about it. But when her provocations fail to elicit the desired response, she begins to act more lasciviously until Kusuki can no longer resist her.