^Have to disagree, he stole nobody. The heroine was supposed to become a couple with that guy, and then MC was supposed to steal her after that fact which would have made that NTR. What instead happens is that MC inadvertently wins her heart before that guy even had the chance to ask her out...
Not necessarily to the point of physically fighting (but still accepted). I like seeing female characters glare at each other and get into arguments with each other over a guy. Like they're enemies. I see a lot of manga where they become "friendly" rivals where they pretty much get along with...
@Nihilist1
I know you already got convinced to try reading it again someday, but I want to say something too.
It was never her intention to be a bully. Believe it or not, the way she behaved in those first chapters are very out-of-character for her. But she did behave that way and the question...
@Shikuretto_Tsuki
Because he is fun to her and she admires his art. She sees he's a good artist and has much potential and drive to improve.
As you see in this chapter, she is popular with the guys. She is used to boys chasing for her affection either by trying to act like Chads or braggarts...