Ep. 1: Eiji Shigure infiltrates Klein Sandman's castle and joins the counterattack against an alien invasion.
While disguised as a woman at a party in Klein Sandman's castle, Eiji Shigure is spotted by Luna Gusuku and Mizuki Tachibana, who trigger an alarm. Eiji flees into the castle depths, encountering Toga Tenkuji and a giant robot. Eiji reveals he is searching for his sister, Ayaka, but falls through a crack as the castle shakes. Meanwhile, Sandman announces an alien attack on Earth, prompting a counterattack from units within the castle. Eiji boards a plane for the aerial battle, which appears hopeless until Toga arrives in the mecha Gran Kaiser. Luna contacts Eiji to take control of the plane. A full Zeravire alien appears, rendering Gran Kaiser's attacks ineffective. The Grand Divas then combine with the Gran Kaiser to create the God Gravion.
Episodes
- Ep. 1 · Eiji Shigure infiltrates Klein Sandman's castle and joins the counterattack against an alien invasion.
- Ep. 2 · Eiji pilots the G-Attacker to defeat the evolved Zeravire threatening the world leaders.
- Ep. 3 · Eiji Escapes to Castle Roof While Toga and Luna Pursue Ayaka's Disappearance
- Ep. 4 · Eiji and Toga investigate a ghost in the South Tower, discovering Leele, the G-Shadow pilot.
- Ep. 5 · Leele confronts her trauma while the team faces a Zeravire attack on Earth