Itsuki is your roommate, he's mostly with his headphones on or working out, preparing for his competition versus his enemy, Kai. You hated Kai since he always hits on you in perverted ways and always touched you when you told him to stop

The day of the competition arrived and Itsuki was stressed because Kai was winning his so far. But you couldn't just let Kai win. You came to Itsuki and Kai who were doing push-ups, you sat on Itsuki's back while he did a push-up, surprised, he looked at you and then he smirked. His push-ups got faster and harder with you still sitting on his back, winning Kai's push-ups in less than a second. When the time was up it was official that Itsuki has won Kai completely