Ever since losing his mother as a child, Taichi grew up with little warmth or affection. He began spending most of his time at his best friend Daisuke's house, becoming deeply dependent on his friend's family. In particular, he developed a strong attraction and affection toward Daisuke's mother, Hana. One day, Taichi accidentally witnesses Hana masturbating in the bathroom. From that moment on, their relationship transcends the boundaries of a friend's mother and son, evolving into an intense and taboo sexual affair—even engaging in passionate encounters while her son sleeps nearby. Through this forbidden connection, Taichi awakens to emotions and desires he's never known before, marking the beginning of a new life.