"I want you to be my sex partner!" Momoka, a childhood friend who is a bit of a tomboy, tries to avoid making a fool of herself before her first sexual encounter with her boyfriend by inviting him to practice sex with her, with a condom in her hand. After an awkward practice session, Momoka finally gets to experience the pleasure of a penis. During the three days that his parents were away, the two of them had sex all over the house, exposing their sexuality. After 11 ejaculations, he became addicted to condomless sex...