The Zeravire danger seems to have temporarily ceased when Gravion was able to execute its final strike. However, when it suddenly rises anew, the Earth Gult and its trump card, the powerful robot Gravion, are need to protect this world once more. Meanwhile, the EFA is developing their own weaponry to combat the Zeravire, the Grand Trooper. As they fight the Zeravire, the people of the Earth Gult and EFA must safeguard their future while also confronting their pasts and unraveling the secrets of the Zeravire.