Through a seemingly trivial encounter, our protagonist, Shirai Kazu, makes his first female friend, a junior colleague. Though they share similar interests, he is unsure of how to approach the expressionless Kirisaki Saya... One day, when he visits her at her house, Shirai becomes overwhelmed by her obscenely developed body and is left feeling uneasy. Finally, Kirisaki invites him over and they cross the line. He instinctively devours this lustful and downer girlfriend. This is the story of him becoming addicted to her voluptuous body.