After witnessing a gruesome murder, 16-year-old Yuri Honjou flees in terror, only to discover herself trapped in an abandoned building with locked doors. As she desperately seeks an escape, she reaches the rooftop to find a desolate world of towering structures. Despite the hopelessness, Yuri's resolve strengthens upon discovering her brother's presence in this eerie place. With masked killers lurking about, intent on causing fear and fulfilling their darkest urges, Yuri faces a harrowing journey to reunite with her brother and survive the looming threat of death.