Zumo, the formidable and aloof captain dominating the university badminton scene, unexpectedly crosses paths with Kao—a tall, handsome, and rebellious freshman. Not only does Kao arrive late on his first day with plenty of bravado, but he also brazenly challenges Zumo on the court, knocking the "undefeated king" to the ground with a single smash. Their explosive confrontation catches the eye of their cunning coach, who issues a strict ultimatum: the two sworn rivals must team up for men's doubles. To make matters worse, the coach imposes a bizarre rule: they must remain inseparable at all times, both on and off the court. The dynamic between the two—shifting from fierce adversaries to a forced duo—begins to change as Kao’s relentless persistence slowly breaks down the icy wall Zumo has built around himself.