U.C. 0123. After a generation of peace, the Earth Federation has begun to build new space colonies to house humanity's growing population. But a new force, the aristocratic Crossbone Vanguard, plans to seize the colonies of the newly constructed Frontier Side for itself. As their home becomes a battlefield, a handful of young civilians struggle to escape the conflict. To save his friends and family, the reluctant warrior Seabook Arno becomes the pilot of a new Gundam which bears the code name F91.

Koji Tsujitani
as Seabook Arno (voice)

Yumi Touma
as Cecily Fairchild / Berah Ronah (voice)

Miyoko Shoji
as Monica Arno (voice)

Takehito Koyasu
as Dwight Camry (voice)

Tomohiro Nishimura
as

Yasuhiro Takato
as

Ai Orikasa
as

Kazue Ikura
as

Masaki Maeda
as Carozzo 'Iron Mask' Ronah (voice)

Chie Koujiro
as Annamarie Bourget (voice)