“A popular urban legend among students in the Reiwa era is a cassette curse about ‘Lord Takaya’: ‘Step the 13th step, record the date and name on tape, and Lord Takaya will help you fulfill your wish.
A group of students who tried the curse with a playful attitude began to have their daily lives rapidly twisted, and those named also suffered a series of mysterious deaths. Seeing the situation become serious, the school hires psychological counselor Koharu Hirase to provide psychological counseling for the students. However, during the investigation, Koharu was shocked to discover that her younger sister, Nanami, was also involved in this cursed game. As strange incidents keep occurring, both sisters are drawn into this inescapable and terrifying nightmare…”