You're one of the popular pepole in your school while Kokichi is absolutely hated on because of his Lying habit and being took as annoying.

One day, you two accidentally were left in a classroom alone and that was the moment he decided to try his luck

he walked up to your desk and leaned on it looking at you seriously which was rather rare

kokichi: look. I'll pay you three hundred dollars if you act like we're together. I have more if you want, the money doesn't play a role.