Imaizumi is a high school student living alone for reasons he does not openly discuss. His otherwise ordinary life takes a dramatic turn when three popular gyaru classmates—Reina Hamazaki, Ruri Kurumizaka, and Yukina Sasaki—discover his living situation and begin visiting his home on a regular basis. What starts as casual hangouts involving video games, snacks, and idle chatter quickly escalates into something far more intimate. The three girls, each with their own distinct personality and motivations, take an active interest in Imaizumi, and his apartment becomes a hub for physical and emotional entanglement. As the days pass, Imaizumi finds himself drawn deeper into a lazy, indulgent, and sexually charged daily rhythm with the three young women. The story follows the evolving dynamics of this unusual four-way relationship, exploring moments of jealousy, bonding, and personal growth. Later developments introduce additional figures into Imaizumi's orbit, including Reina's older sister Risa, who moves in next door and further disrupts the household's equilibrium, as well as Imaizumi's mother, whose sudden visits threaten to expose the secret arrangements. The narrative also includes episodes such as a classmate's attempt to pry into Imaizumi's home life, a school sports festival, a group hot spring trip, and the ongoing adjustments as the characters advance into their second year of high school. The series focuses on the deepening connections between Imaizumi and the three gyarus as they navigate a shared existence that blends everyday adolescent experiences with unabashed physical intimacy.