Ryou arrives at Jousei Academy, convinced the transfer was destiny at work. The welcoming smile of Aina, the trusted Japanese history teacher and gymnastics club advisor, masks a deeper connection, as her older sister Yuuna once crossed paths with him in a concealed incident. During a private meeting, Ryou draws Yuuna into an intimate act while Aina watches, stirring intense fury and unexpected physical sensations within her. As emotions and desires collide, the episode sets the stage for escalating tensions at the academy.