He imitates Daisuke and fakes its death in human form to convince the other Riders that the real Daisuke is a Worm. After losing to the other four Riders, Daisuke lost the Drake Grip. Kageyama made it look like he was returning the Grip to Daisuke, but the Acarina Worm Amber instead takes the Drake Grip while disguised as Kazama and transforms with it. After Kabuto knocks the Drake Zecter Gun out of the Worm's hand, the Zecter flees, undoing the transformation, and Gon retrieves the Grip, returning it to the real Daisuke, who defeats the Worm. He was defeated by Drake's Rider Shooting and destroyed by punches then being slammed into the ground. When wielding the Drake Grip in battle, the Worm was left-handed while the real Daisuke was right-handed.