When transfer student Sakura Sakuraba arrives in the secluded town of Yuuyamichou, she immediately senses something is wrong. The town is steeped in bizarre and ancient customs, and every child she meets has an unusual name. More disturbingly, Sakura discovers that all the children living in Yuuyamichou are bound by a strange curse that physically prevents them from leaving the city limits until they graduate from high school. Trapped in an escalating environment of supernatural menace, Sakura finds herself caught in a nightmare of curses, summonings, and betrayals that permeates daily life.

Determined to understand and break the curse that holds the town's youth hostage, Sakura teams up with Uzu Andou, the enigmatic president of the school's Paranormal Club. Uzu seems to possess deep knowledge of the town's occult secrets and the strange forces at work. Together, they begin investigating the mysteries of Yuuyamichou, with their unconventional club activities forming the frontline of their resistance against the supernatural forces plaguing the community. As they delve deeper into the town's dark history, they must navigate dangerous rituals and uncover the truth behind the ancient customs that bind everyone to this prison of a city. Their strange partnership marks the beginning of a fight for the freedom of every child trapped in Yuuyamichou.