On the rooftop that had been closed for a long time, the girl was given a romantic birthday confession by her boyfriend, but inadvertently triggered a long-running strange rumor. A chess game of headless clowns, hanging marionettes, giant puppet bears and mutilated stone figures. The disappearance of her boyfriend made this rooftop birthday night mysterious and blurry, and the memory fragments that kept popping up gradually became clear as clues were discovered.
Exactly who is the girl? Is this weird school real or a dream? Where is the lost boyfriend?