The last of the ChouSeiShin series, it opens to Earth in the year 2500 when it taken over by a group of space pirates known as Neo-Descal. The remaining members of the human resistance send their trump card weapons, the three RyuuSeiShin warships to the past to try and change the future by defeating Neo-Descal's ancestors, the Descal fleet, when they invade Earth in 2005. Along with the RyuuSeiShin comes Ad, captain of the Adle-Eagle squad and his right hand man, Gordo, Kane, captain of the Beet-Vizor squad, and the twin Sazers Ein and Zwein, and Remy, who pilots Great Lio. Ad and Kane are joined by Takuto Andou, whose grandfather met Captain Shark, leader of the resistance, as a young man and was left with a Knuckle Cross to allow his grandson in 2005 to become the third member of the team known as Sazer X.