In class 3-3 of Yomiyama North Junior High, transfer student Kouichi Sakakibara returns after taking a sick leave for the first month of school. Among his new classmates, he feels an inexplicable pull toward Mei Misaki—a reserved girl wearing an eyepatch whom he met in the hospital during his absence. Yet none of his classmates acknowledge her existence; they warn him not to get involved with things that do not exist. Disregarding their caution, Kouichi befriends Mei—soon uncovering the sinister truth behind his friends' apprehension. The ominous rumors center on a former student of class 3-3. However, no one will share the full details of the grim event with Kouichi. Engrossed in the curse that plagues his class, Kouichi sets out to discover its connection to his new friend. As a series of tragedies unfold around them, it is now up to Kouichi, Mei, and their classmates to unravel the eerie mystery—but doing so will come at a hefty price.