Rokushin Gattai GodMars: Juunana-sai no Densetsu

Synopsis

Marg is left stranded on the planet Gishin after Zure kidnaps her younger brother Mars and murders their parents. She then joins a guerrilla group to resist Zure and grows attached to Ruru, the daughter of resistance leader Ura. When the resistance is wiped out, Marg is captured and brainwashed into working for Zure. Her desire to reunite with Mars is granted, but it forces her to fight against him. The OVA features redesigned versions of Gaia, God Mars, and the Gishin robot Zeron, and presents an alternate telling of Marg's time on Gishin before the events of episode 19.