Erujo and his partner Francoise Cardan are controlled by Zofis. They are part of the squadron of ancient mamodo commanded by Penny, as she ordered Erujo, Boru Bora and Dogmos to attack Zatch and burn his book. He first used Biraitsu but Zatch use Rashirudo. Then Erujo used Bireirudo with Dogmos Grandsen and Bora Bora Ganzu Garon and while Zatch used Rashirudo for protect himself. However, the bireirudo broke the rashirudo and he followed up with Ganzu Biraitsu. After this Zatch was forced to use Baou Zakeruga but Erujo used Daibara Biranga and Bora Bora Gigano Garanzu suddenly Tia appears to help Zatch. With Tia's help Zatch defeated Bora Bora and Dogmos but Erujo escapes with Penny. Erujo was the only one of the squad who managed to survive. Erujo and Francoise are then rescued by Uri. Later, Erujo is defeated by Brago.