After Yuki and Kurumi give Tarōmaru a much-needed bath, the girls discuss their plans after they graduate while Yuuri recalls the day, she and Megumi started the School Living Club. Later that night, Miki becomes curious about the school's excessive facilities that have allowed them to survive and joins Yuuri in searching the staff room for whatever Megumi's key unlocks. With Yuki's help, they find a hidden safe containing an emergency manual, which reveals the school was involved with a biological weapon and was constructed as a safe house in the event of an outbreak.