After Gravion was able to use its ultimate attack, the Zeravire threat seemed to have temporary stopped. However when it rises back up all of a sudden, the Earth Gult and its trump card, the super robot Gravion, is needed to defend this world again. All this while, the EFA is planning to create their own weapons to counter the Zeravire, the Grand Trooper. Now as they attempt to fend off the Zeravire, the people of the Earth Gult and EFA must protect their future as well as confront their pasts, and unveil the mysteries of the Zeravire. (Source: ANN)

The story begins with the arrival of a brave young boy in Paris. His ambition is to join the glorious Imperial Guards, but fierce competition and the minimum age requirement hinder him from joining. The boy then challenges the well-known Three Musketeers in order to demonstrate his excellent skills with the sword. However, at the very moment the fight begins, a power-hungry group cuts in. Realizing their wicked intention, the boy D'artagnan and the Three Musketeers quickly cooperate and defeat them. This is the beginning of their friendship and commitment to fight conspiracy.

In 1625, the young D'Artagnan leaves his village in Gascony to embark for Paris with his grandparents' blessings, taking only his father's sword and a letter of introduction. Seeking audience with Tréville, Captain of the Musketeers of the Guard and his late father's comrade, the poor nobleman aims to become a great hero in the service of King Louis XIII. The young adventurer is astonished by the massive size of Paris, but also overwhelmed. He wanders the city streets, befriending a young orphan named Jean. However, he also ends up offending three of the Musketeers of the Guard: Porthos, Aramis, and Athos. Confronted by the Parisian guards over their illegal dueling, D'Artagnan and the Musketeers fend off five of Cardinal Richelieu's soldiers, and the four of them quickly become friends. The four new comrades set off to stop the Cardinal from starting war between England and France, and protect the image of Queen Anne d'Autriche, the wife of Louis XIII. But what will be the cost of their efforts? [Written by MAL Rewrite]

It is 199X A.D. In Kushiro, Hokkaido, three bodies of Dragonite appear. Possessing overwhelming destructive force, they attack the city. They also awaken the evil Jashin Drago from the holy seal he was trapped in. 200 years ago, Drago was trapped in the seal by a holy warrior with the tattooed mark of the Liger. Assuming that the warrior is dead, Drago and Empress Zara are free to conquer the Earth using their army of biomechanical beasts. Even the Japan Self-Defense Forces are no match for the Dragonites' awesome power. One of the people fleeing is the protagonist, a milquetoast 16 year old boy named Ken Taiga. Unbeknownst to the Dragonites, Ken realizes that he is the descendant of the Liger warrior! In a burst of anger, Ken's Liger birthmark appears, and he rises his palm into the air, shouting the henshin command, "LIGER!!!", which then covers him in demonic long-haired biomechanical armor. Ken transforms into Jushin Liger to fight the evil forces of the Dragonite! (Source: Wikipedia)