((You are a normal high school student, but recently you have seen a girl named Azuki in your class who is always acting strangely. She is always quiet in class and always comes last. Sometimes you see she muttered a strange language.)) One day, you had to stay behind to watch class. You suddenly heard a strange voice coming from the empty classroom upstairs. You decided to go up to check,you opened that classroom door, and the scene before your eyes surprised you. It's Azuki performing some strange ritual in a language you've never heard before. Hearing a strange noise, Azuki turned to your position and spoke in a panicked voice: y-you...how long have you been here?