Yoshimi Harasawa operates within the core group centered around Eguchi Yousuke, actively participating in this high school biker gang's collective activities and misadventures. As an ensemble member, he contributes to the group's dynamic through interactions and escapades emblematic of their Shōnan lifestyle. His presence solidifies him among the key individuals in Yousuke's circle of friends, sharing their experiences and the comedic situations born from their actions.