Due to her husband's job, KAORI moved into an apartment. Her neighbor, a young man in a band, responded coldly when she greeted him. Every night, his friends gathered at his place, creating loud noise that dominated the night, constantly banging on the walls. Her husband grew furious at the disturbance, but to avoid conflict, he made KAORI handle it alone. As a result, the young men became drawn to KAORI's beauty and charm, and began teasing and harassing her daily. The sound of pounding on the wall became a signal—sparking a new, twisted relationship.