Episode 4 introduces a strange being called “A.” Unlike the usual enemies in the series, this creature is neither human nor a yokai, which makes it even more mysterious and unsettling. Its appearance causes strange phenomena around the school, and Nube realizes that it’s something different from the spirits he normally deals with. The episode becomes more tense as Nube tries to understand what “A” really is and how to stop it from harming the students.

Episode Context

After Episode 3's warmer, character-focused chaos surrounding Yukime's return, this episode yanks the cour into psychological horror territory, a deliberate contrast that signals the season is willing to go to uncomfortable places. It challenges Nube's usual formula by presenting a threat that resists supernatural brute force, raising the emotional stakes for the cast. This sets the stage for Episode 5's shift toward ancient, large-scale mythological danger with Daidara-bocchi, suggesting the back half of this cour is building toward increasingly formidable threats.

Runtime23 min

Filler StatusN/A

Plot ImportanceMED

Air DateJan 28, 2026

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