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Confinement

Episode number: 1

Overview: When Ryoka, a high school girl, wakes up, she is left behind in a sealed-off apartment. A message from her mother tells her that there is a mysterious creature called "X" in the apartment.

Reunion

Episode number: 2

Overview: When Ryoka hears that her childhood friend Shuhei is also left behind in the apartment, she calls him. What is the ecology of "X" that her mother told Ryoka as she waits for Shuhei to join them?

Brainwashing

Episode number: 3

Overview: Ryoka and Shuhei manage to escape from "X" just in the nick of time. They try to leave the apartment, but suddenly lose consciousness.

Encounter

Episode number: 4

Overview: X has good hearing and walks on two legs. Ryoka is perplexed by the fact that X has different characteristics than what she saw in her dream, but first she heads to the fourth floor where Shuhei is waiting to meet up with her.

Resistance

Episode number: 5

Overview: Thanks to Shuhei's quick thinking, he manages to distract X's consciousness. However, X's pursuit does not stop, and Shuhei is eventually captured by X.

Light

Episode number: 6

Overview: Ryoka and Shuhei make use of X's blindness and reach the elevator safely. What awaits the two on the 31st floor, which should not exist?