When Hizuki Reiji, a seemingly ordinary high school Japanese teacher, takes on a temporary role in a new town, he discovers a web of strange rumors, eerie legends, and unsettling discoveries. His predecessor, Sakuraba-sensei, vanished without a trace, leaving behind a cloud of suspicion. All eyes are on Magaki Kyoichi, the troubled student rumored to have wielded a blood-stained knife before her disappearance. As the authorities close in on Magaki, Hizuki finds himself entangled in a mystery that raises questions about what truly befell Sakuraba-sensei and the unexpected ties that bind him to Magaki.