In the halls of an unsuspecting academy, a mysterious tome falls into the hands of student Takashiro. Together with like-minded peers, she establishes the school's first occult society, where arcane rituals soon prove useful in granting wishes and settling scores among classmates. As the group's experiments intensify, Takashiro finds herself sidelined by unforeseen forces. With a new figure at the helm steering events toward shadow, newcomer Kitami must confront a pivotal decision that could alter her path forever.