Mana goes to Cat-girl saying, "lately, creepy things have been happening at school." After learning that one of the seven wonders of Mana's school, Hanako-san of the third floor girl's bathroom, is a friend of Cat-girl's, the two of them go to see Hanako, but they can't find her. And it's not just her. None of the yokai of the other seven wonders has been seen lately. Just then, the Sand-throwing Hag and Child's-cry Old Man arrive, having not been able to contact their old friend Ninomiya Kinjirou. They sense someone's presence and chase after it, all the way to the boy's bathroom on the second floor... What is happening at the school?!
You know how every school
has its Seven School Mysteries?
تعرفين كيف أنّ لكل مدرسة سبعة ألغاز؟
Du kennst doch sicher die „sieben Schulwunder“,
die es an vielen Schulen gibt.
Suele haber siete maravillas, ¿no?
Suele haber siete misterios, ¿no?
On parle souvent
des « sept mystères de l’école », non ?
Sabe como toda escola tem Sete Mistérios?
Знаешь же, что в каждой школе 
есть свои семь тайн?