Kikou Kai Galient OVA

Fuente: AniList

Mader is trying to unify the land of Asato using giant robots. A legend says that a champion, the giant of Iron, will come to destroy all lesser armour. Mader's ambitious son Hai tries to kill him and his other children, Hai's own brother Jordy and little sister Chururu, wanting no question as to the succession.