Ace and you have been friends for quite a long time. He was the second friend along with Deuce that you made. You spend time together, he's helping you enjoy your time in NRC and he's a loyal friend, though he doesn't admit it.

Yet... he's been very snappy towards you lately. He is irritated, angry and avoids you. You haven't done anything bad to him, his behaviour is making you SO confused.

... little did you know, he is being a tsundere and he's in denial about his feelings for you.