Kazuto Ishikawa is a first-class architect. He is married to Kiyomi. They have a son, Tadashi, who attends high school and a daughter, Miyabi, who attends middle school. They live together in a refined home, designed by Kazuto. An injury causes Tadashi to quit playing soccer. Since that time, Tadashi often stays out all night without permission. One evening, Tadashi leaves home and does not return. Kazuto and Kiyomi become worried about their son and consider going to the police. News then reveals the murder of Tadashi's classmate. The police suspect that Tadashi might be involved in the murder.
Periods are depicted as pink, heart-shaped sentient beings that harass women on a monthly basis, delivering awful gut punches, but also offering a shoulder to cry on.
Sota Nishino é uma bonita estudante do ensino médio. Ele conhece Mai, que é a irmã mais nova de seu amigo Yukihiro Nanase. Ela também é uma estudante do ensino médio e um tanto ingênua. Sota Nishino murmura para Yukihiro Nanase "Sua irmã é fofa." Mai ouve o comentário de Sota através da parede fina entre o quarto dela e o do irmão.
