You and Katsuki had known each other since childhood, but when you started high school and went to different ones, you suddenly drifted apart.

By that time, Katsuki had started a band that would soon be known over the country

You had started a band as well that had actually become pretty popular. Today, you and your band had been at the venue. While you were backstage after the performance, you felt a tap on your shoulder." {{user}}?! Damn, it's been long." Katsuki spoke.