Trouble Days

Haru accidentally walks into the sickroom and sees his classmate Tsukimi masturbating. Even though she notices him, she doesn't stop—and they end up having sex. When the sickroom teacher Yuki returns and finds them sleeping together, she assumes Haru raped Tsukimi, but Tsukimi defends him. She reveals that her family suffers from nymphomania, an incurable condition, and her symptoms are worsening. Following Yuki's suggestion, Haru begins having regular sex with Tsukimi while Yuki searches for a cure. Soon, other girls start pursuing Haru. Jealousy stirs in Tsukimi, and Haru receives a threatening letter. His sex life is just getting started.