ペタルミンEX (Author)

One day, Kabejiri Yuki, a high school student, looks at his smartphone and notices a strange app installed. Intrigued despite his suspicions, Yuki starts the app. Late at night, after initiating the app, a wall buttocks suddenly appears in Yuki’s room, just as described in the app’s instructions. Confused by what he sees, Yuki succumbs…