Sakura Academy, a renowned institution of learning in Kyoto, harbors a chilling secret: its corridors are infested with malevolent spirits that feed on the hatred and rivalry among the students. Kaito, a young man with a connection to the spiritual world, arrives at the school in search of an ancestral entity his family has been pursuing for generations. Amidst the unsettling nights, Kaito realizes that the spirits might be possessing the students, causing an atmosphere of terror and violence within the school.
As he investigates, Kaito uncovers a horrifying secret: a student, whose identity remains shrouded in mystery, has been burying corpses in the school's botanical garden, using the remains as fertilizer. The school, protected by its reputation, remains oblivious to the truth as darkness takes hold of its walls.
Aiko, a 50-year-old ghost trapped within the school, encounters Kaito and is drawn to his warm aura and his determination to combat the evil that engulfs the Academy. Together, they must unravel the truth, confront the malevolent spirits, and stop the terror that haunts the students.