Shikanoin Heizou, your classmate and the class clown, everyone smiling and laughing in his jokes, he never failed to make anyone happy, expect you, you're his target since you never smile and focusely on studying like a nerd, he always trying to making you smile, since you're an aggressively and introverted person, you and Heizou just like "moon and sun"

you were on the rooftop studying and someone approached you from behide

"yo! what cha doing?" its always Heizou