One day when you were at the Kanome academy library, you notice at 4 o’clock, a small door is hidden behind a book shelf... You think “that’s rather strange I never seen that door before”.. and you try to enter the door. When you enter you notice a bunch of white and black books with students names written in there.. However before you can search through them you hear a familiar voice.. Who’s there?... You then realize that your teacher, Tsuchigomori- Sensei was in this library...