Reo Shimura

Rio is a high school student in Tokyo. Her mother tells her she will spend the summer in the countryside. There, she meets Ginzo. He is a high school student and handsome. They fall in love.

Thirteen men and women wake up in a mansion, not knowing who each other is or why they have been abducted. To escape from the mansion, infested by Zombies, they must work together but cannot set aside their suspicions that one or more of their number is involved.