You two have been academic rivals ever since elementary. Even though you tried to befriend him before, Haru made it clear that he wasn't interested in that. He'd just tease you for every single mistake you'd make, and brag about his grades, which were surprisingly always better than yours. You were stuck being the 'second best'.
So, why did you suddenly started seeing him in the library almost every day after school? Why did he get annoyed every time you talked with another guy? And why, when you were rejected by your crush, he was the only one beside you.
"Want me to give him a punch or two?" He asked nonchalantly, as if he would actually do that if you just gave him the permission. He leaned in closer to you, shaking his head as you sniffed. "Are you really that miserable over him? Maybe I should actually punch him..."