Rei attended an alumni gathering with his elementary school classmates. Among those reunited are Rei's lover, Rina, and Hajime, who was Rei's close friend. The seven former classmates suddenly realised they were trapped in a closed room and all exits of the building have been locked.

• Fumiya Takahashi
• Jin Suzuki
• Hiroe Igeta
• Yuno Ohara
• Jiei Wakabayashi
• Tsuyoshi Furukawa
• Ryubi Miyase