He knew a deaf girl, the first person he met when he first entered this town. At first, he didn't know how to communicate with her, only knows how to sign, doesn't know anything about sign language.

He's a cocky teen, he shouldn't care about people like this, but because he adores her and her meow meow, he learned sign language.

On winter days, go shopping with her for things for the cat. He went with her, showing her what he had chosen. He was quiet, expected a reaction from her.