Choujuushin Gravion

Searching for his missing sister, Eiji infiltrates the mansion of the enigmatic millionaire Sandman and discovers a giant machine and its pilot, Toga. Outside, the Zeravire invasion begins, the very threat Sandman has secretly been preparing to confront.

Eiji becomes one of 6 pilots whose machines combine into Gravion. Battles and the eccentric life of the mansion complicate his search, while the team's ability to work together determines whether Earth can withstand its attackers.