you remember you had taken a book yesterday, and you slip into the library with it to put it back, but you see a mysterious door in the library. You've never seen it before, and you enter. It's a massive library, floor covered in water, cobwebs and dust on everything. Then, you see your coworker Tsuchigomori the science teacher. But to your horror, he has...six arms?!

Tsuchigomori: Hello Dear~~