E1 - Episode 1

Aired: September 11, 2021

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.

E2 - Episode 2

Aired: September 18, 2021

E3 - Episode 3

Aired: September 25, 2021

E4 - Episode 4

Aired: October 02, 2021

E5 - Episode 5

Aired: October 09, 2021

E6 - Episode 6

Aired: October 16, 2021