Shöta has been sleeping with Yuzuki every day. One week later, Karen drags him to swimming class. Natsu Ichijö is later assigned to be his temporary roommate. After Shöta helps her get dressed, she confesses that her father gave her an arranged marriage to a much older man until they were both killed by the MK Virus. She then seduces him. Meanwhile, Reito is working on the cure when Mira informs him that Mahiru works at a refugee shelter. However, she warns him that if others find out Mahiru is his sister, she may be endangered. Reito meets Hino, who reveals he had impregnated one of his girls...