The Gravion team completes another mission, mucht to the delight of the president. Someone says the Zerevie are going to return at any moment. The team is made to be maids, due to a strip mah jongg game that got out of control. They are forced to cook, clean, do the laundry, repair robots, and more. Eiji is forced to wear a dress.
Meanwhile, Mr. Sandman is meeting with someone elsewhere. Back at the mansion, Luna shows off Toga's room when he was a child to Eiji. Then the G-alert sounds. The Grand Knights go to intercept the intruder. After much destruction, they decide to combine, but cannot. He's stuck in a subway. After trashing a street punk, Sandman shows up and lets them combine into Gravion. A lot of chaos and distruction ensues, ending with the Zerieve being destroyed.
Elsewhere, some generic sinister people are plotting to reshape the earth...
街に平穏が訪れて数ヶ月、サンドマンはゼラバイアの再侵攻に備え、旅に出ていた。一方、緊張感の無いサンジェルマン城では、賭けの結果エイジ達が、一日メイドをやる事に。そして再び、謎の男に率いられたゼラバイアが襲来する。サンドマン不在のグランナイツは、立ち向かう事が出来るのか？
Lange war es ruhig auf der Erde - die EFA hat diese Ruhe genützt, um ihr eigenes Team an G-Soldaten zusammenzustellen. Angeführt wird dieses von Fei Xinlu, die Tōga zu kennen scheint.
