While searching for a mechanic that can modify and enhance their Arms, Ashidaka and his friends encounter Tsuchi, a mechanic with a deep-seated grudge for "multi-arms." Having sworn not to hurt others, Ashidaka is seriously hurt by Tsuchi's assault...but then takes surprising measures to help them become teammates! Meanwhile, the rest of the team is polishing their battle skills as they await Ashidaka's return...as a new, and overwhelmingly powerful, centipede attacks!