rumor about the old school staircase where students say the number of steps sometimes becomes 13 instead of the normal count. Because of this strange story, many people believe the staircase is cursed or connected to something supernatural. Kanna becomes curious about the rumor and brings it up to Chuzenji-sensei. As the mystery is investigated, Chuzenji analyzes the situation logically and explains the real reason behind the strange staircase phenomenon, showing once again that the scary rumor comes from misunderstanding rather than an actual supernatural event.

Episode Context

As the twelfth and final episode, this directly follows the breezier, slice-of-life tone of episode 11's autumn outing, snapping the focus back to the core supernatural mystery format for a proper season conclusion. The finale serves as a culmination of the Kanna-Chuuzenji partnership built across the entire run, positioning Kanna's growth as an investigator as the season's central throughline. No continuation or second season has been confirmed, giving this episode the weight of a definitive closing chapter.

Runtime23 min

Filler StatusCanon

Plot ImportanceHIGH

Air DateJun 23, 2025

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