Ver en Cuevana. Sayo moves from Tokyo with her mother to her grandmother’s house in the country. On her first day of school as a transfer student, she witnesses her new friend Maho getting bullied by her classmates. However, she fails to save her due to fear of being the odd one out. When she returns home, she becomes worried that Maho was trapped in the school bathroom. Soon, she discovers that Maho has died…