A young woman's visit to her grandparents' home leads to the discovery of what's brought them happiness, a revelation that will lead her to question her choices, sanity and reality itself.
A college student visits her grandparents’ house in the countryside. It has been a while and she relaxes into a warm welcome. When some noise is heard from the second floor, her grandmother freezes her movement. Is somebody up there?
High school student Ai sees her world collapse when a strange cult-like mentality gradually turns people around her into mindless followers who can transform simple gymnastics routines into a nightmarish dance of death.
