Junpei serves as a supporting character and friend to Akira. He actively participates in group endeavors alongside Mimi and other bio-computers. During one specific incident, he engages with Mimi throughout her online adventures where she confronts rival bio-computers. Later, he joins forces with Akira and Mimi to defend against an invasion by Nackintosh bio-computers, contributing to their collective defense during the conflict. His involvement consistently surfaces during collaborative efforts to address challenges from other bio-androids or external threats.