Seven years ago, he was the prince and sole heir to the throne of the Britis Kingdom, which was destroyed by the Zabiloniya Empire. To escape his pursuers, he was taken by Armor Knight F90 to Belfast Village, where the Wise Man Antonio lives. Seven years later, after a battle with the Evil Knight Zaku S who came to the village, he recruited allies and challenged the Zabiloniya Empire to rebuild the Britis Kingdom.

After saving the Lanarre region, he wears the royal family's "G-Armor". After conquering the Zedan Fortress, he is given the "Full Armor" by Wise Man Antonio. After recapturing Britis Castle, he inherits the throne and becomes King Gundam II, leading the new Knights of the Round Table to the final battle against Zabiloniya.