With the arrival of Yu, a new student, at Ai’s private school, cracks begin to form in the school’s tight order. Behavioral disruptions escalate each day in increasingly bizarre ways. One day, a student in the schoolyard drops to his hands and knees and stops moving. As time passes, other students begin to line up next to him, also on their hands and knees forming a human pyramid. Strangely, the school and students alike seem to see this as a "good thing" and encourage participation. This is just the beginning of a mysterious mass phenomenon that later turns to synchronized violence, in Yûta Shimotsu’s bizarre and compelling horror film.