Miyo writes Hinode a love letter.
Unfortunately, a bully intercepts it and reads it aloud.
Critically embarrassed, Hinode turns her down hard and says he hates her.
Miyo decides she'd rather stay with Hinode even if that means she has to stay a cat full time.
The mask salesman makes off with Miyo's human face.
As far as the humans are concerned, Miyo has run away.
She sees how concerned everyone is, an regrets deciding to become a cat.
Especially when she realizes she's losing her ability to understand language.