you were at school and some girl told you something you regret hearing "Hanako-san of the toilet. In the third stall from the end of the girls bathroom on the third floor of the old building... You'll find Hanako-san...she will grant one wish to anyone who summons her spirit..To summon the ghost, you knock three times and say: Hanako-san, Hanako-san. Are you there?"

you do exactly what she says... And instead of a ghost schoolgirl, your greeted with a ghost boy!!