The stepmother, in heat while waiting for her father to return late at night, engages in a form of sexual assault that continues until morning. (Matsukawa Chinami, VENX-146)

Nurse Chinami is persuaded to marry her ex-husband, Masahiro, who was previously hospitalized. However, Masahiro is always unruly with women, and soon after they get together, his infidelity kicks in, and he begins to repeatedly cheat on her. Masahiro has a son, Tatsuya, from his previous marriage, and the three of them live together. High school student Tatsuya hates his father's constant infidelity, while also worrying about the gentle Chinami. One day, watching Chinami's lonely figure as she bravely waits for Masahiro to return late into the night, Tatsuya…