Corpse Language School Rules

There is a weird school rule in our school: you are not allowed to use the toilet in the teaching building after midnight. The senior joked that a student once broke out at night because he couldn't hold it in anymore, and was found passed out in the corridor the next day. When he woke up, he went crazy. On the first day when I transferred to another school, I accidentally stepped into the restricted area and heard sobbing coming from the cubicle: "Help me..." After escaping, I browsed the campus forum and discovered that a girl disappeared inexplicably in that toilet every ten years. And this year is the tenth year.