At the age of 18, Chu Yuan faces tremendous pressure to prove his competence as the new emperor of Chu State. He must be careful with his decisions, especially with the ongoing unrest at the borders of Chu and Xinan. However, the matter is taken from his hands when Duan Baiyue—the young Xinan King—puts an end to the rebellion himself. His aid spares Chu Yuan an insurmountable amount of grief, and the people of Chu now hail Duan Baiyue as their hero. Two years later, Xinan's influence has grown, stirring rumors that Duan Baiyue intends to take over Chu State soon. As he stands before a winter plum tree, a furious Chu Yuan does not know what to think and recalls a promise made long ago. The tension reaches a breaking point when a visiting duke of Ahnu, an ally of Chu State, is found dead in the streets of Chu.

With the threat of Ursus and Reunion doubling down upon Lungmen, Ch'en, once the city's fiercest defender, renounces her loyalties before Lungmen's Chief Executive Wei Yenwu, revealing herself as Infected and the sister of Talulah, Reunion's enigmatic leader. Cast adrift from Lungmen with an arrest warrant, Ch'en sets out to confront Reunion, convinced that she alone can deliver the reckoning her sister deserves. As Rhodes Island intervenes to prevent total annihilation, Doctor, Amiya, Kal'tsit, and the rest of the team hope to navigate a conflict where the faintest spark of justice may at last ignite Lungmen's rise from its embers.

Big Battle is a one-shot OVA set after the climax of the original Votoms storyline, but before the epilogue at the end of the series itself. With the Gilgamesh and Balarant forces still trying to advance their PS programs, Chirico and his old friends are forced into one last gladiatorial battle against a special PS and a formidable land battleship.

There once existed a planet named Beal, until it was wiped out by the mysterious entity known as Gaizok. The few remaining survivors escaped to Earth and split into three families, named Jin, Kamie, and Kamikita respectively. While attempting to start a new life, the collectively known Jin Family prepared for the inevitable Gaizok invasion on Earth and its giant mechanical beasts known as Mecha Boosts. In order to defend their new home, they have built three vehicles which when combined form the mighty Zambot 3. The Jin Family must not only defend against Gaizok attacks, but also harsh criticisms from the very people they protect, who blame the Jin Family for the invasion in the first place. (Source: AniDB)