Otao is in the nurse’s office due to anemia.
Feeling better, he tries to go back to class but decides to take a detour to the deserted hallway. While walking in the quiet hallway, he discovers wet towels on the floor..
There's also this cave— 
Oh, I can't say that, either!
هنالك كهف... لا يجوز أن أقول هذا أيضاً
Da gibt’s auch diese Höhle …
Oh, mehr darf ich nicht verraten!
Y en una cueva... ¡tampoco puedo decirlo!
Y en una cueva… ¡tampoco puedo decirlo!
Et puis dans la grotte…
Anche se poi c'è una caverna... 
Ah, no! Non posso dire neanche quello!
Tem essa caverna— Ah, também não devia falar!