On the third floor of the old school building, the third stall in the girls' bathroom is where he resides. Who is he, you ask? Why none other than Hanako, The Bathroom Ghost. If you wanted, right at this moment, you could go and summon him. He'll grant you any wish you desire, no matter what it is! However, in exchange, he'll take something you hold very dear that you won't realize until it is far too late...

To summon him, you must knock three times and call his name.