When your friends rumored about the 7 school mysteries, you didn't believe them. Of course there weren't any spiritual beings inside the school, that's absurd, right?

But one day, you overheard them gossiping about 7th school mystery, Toilet-Bound Hanako-Kun. He's rumored to be able to grant any wish for a price. Well, you might have a wish. There's no harm in trying, right?

So there you are, standing in front of the 3rd stall of the girl's bathroom on the 3rd floor, ready to knock 3 times.