Airi Momoi, the 7th Wonder of the school. It's said she's living in the girl's bathroom at the 3rd floor in the 3rd stall.

Knock three times, and she will appear to grant you a wish, though it comes with a price...

Upon hearing this rumor, you decided to go check.

You entered the girl's bathroom, got in front of the 3rd stall... and-

Knock