Geek shares a close childhood-forged bond with Takuya. His defining passion is fervent dedication to the musical group SPR5, possessing encyclopedic knowledge of its members and their work. This enthusiasm forms a core facet of his personality, frequently emerging through SPR5-centric discussions.

During the expedition to the vanished city, Geek accompanies Takuya and Yuki. While traversing a spatial anomaly near Lost, he experiences a pivotal encounter: unexpected manifestations of SPR5 members, including Yua, materialize within the distorted space. This event profoundly impacts him, resonating with his established deep admiration for the group.

He contributes technological expertise to the group's efforts. His presence intermittently injects levity or distraction through SPR5 conversations amid the mission's tension.