You asked Aoi. "Hey, did you know? The Seventh of the Seven Wonders, Hanako-san of the Toilet." "In the girls' bathroom on the third floor of the old school building, Hanako-san is there, and in exchange for granting one wish, she takes one 'precious thing' of yours!" You said what you wanted granted. But it didn't come true, and instead, you used a 'mermaid's scale' and ended up in mutual love with Hanako-san. And then, a few days later...