>>214031607
>Also, I've never heard 春日 hates big chests that much and I tried googling it but I couldn't find any clues at all.
Me neither. I don't get it.

>Is 髪の毛を伸ばす not a more natural and better way of expressing you grow your hair longer?
Of course. The verb "生やす" must be chosen for particular reasons (like Kasuga himself used it and the whole line became a meme), but I can say anything for sure. Nothing seems to fit well other than the hair as to what was 生やすed.