E1 - Confinement

Aired: September 07, 2024

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.

E2 - Reunion

Aired: September 14, 2024

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?

E3 - Brainwashing

Aired: September 21, 2024

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

E4 - Encounter

Aired: September 28, 2024

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.

E5 - Resistance

Aired: October 05, 2024

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.

E6 - Light

Aired: October 12, 2024

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?

E7 - Inheritance

Aired: February 22, 2025

Ryoka and Shuhei have made it to the 31st floor, which shouldn't exist in the apartment building, and have cleared level 2.

E8 - Signpost

Aired: March 01, 2025

Ryoka discovers a candy house. There, she finds a witch who is a level 3 X. Ryoka is thrown into a loop again and heads off to confront the witch.

E9 - Witch

Aired: March 08, 2025

Ryoka and Shuhei fight the witch to save the captured Hansel and Gretel. The witch uses spider webs to immobilize the four of them.

E10 - Foreknowledge

Aired: March 15, 2025

After defeating the witch, Ryoka and Shuhei take the elevator to the 32nd floor.

E11 - Blank

Aired: March 22, 2025

Without any clues from the notebook, Ryoka and Shuhei challenge Level 4. Ryoka is driven to despair by the fear of being killed again.

E12 - Future

Aired: March 29, 2025

Having grasped the true identity of X, Ryoka and Shuhei make a desperate attempt to conquer Level 4.