Shuumatsu no Harem

Synopsis

Shouta has been sleeping with Yuzuki every day. One week later, Karen drags him to swimming class. Natsu Ichijou is later assigned to be his temporary roommate. After Shouta 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. When Yuzuki returns, Shouta confesses that he slept with Ichijou and begs for forgiveness, but she says they all know and he belongs to everyone. He confronts Karen and demands answers. She takes him before the class and says she reopened his old school to make him comfortable so he would mate and repopulate the planet. All the girls then strip naked before him. The council says that since Reito refuses to mate, Mira is useless and will be removed from her post.

(Source: Wikipedia)