Ep. 4: Keita Aono navigates school life and strange disappearances after a dangerous weekend with Hinoki Sai.

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Keita Aono returns to school after a traumatic weekend involving robot piloting and a plane crash with his friend Hinoki Sai. Although he views the classroom as a safe haven, he faces social awkwardness, including being ignored by Hinoki. He engages in a serious conversation with his classmate Ushii, who reveals that several students have vanished without a trace. Keita attempts to memorize the Kakuseijin operations manual and confront Hinoki about her behavior. Meanwhile, Hinoki encounters a masked man with a blowtorch in the school basement while retrieving paper. The narrative questions whether the supernatural events from the weekend have infiltrated the school environment, leaving Keita and Hinoki to deal with these new threats while maintaining their daily routines.