監禁区域レベルX (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: Ryoka, a high school girl, wakes up to find herself stranded in a sealed off apartment building. According to a message from her mother outside, there is a mysterious creature called "X (Sai)" in the apartment... A popular work on the e-Story application "peep" has been comicalized by an up-and-coming author. This is the start of a terrifying panic dark fantasy.

(Translator: DeepL)