The 10th Metal Hero installment is also the second series of the Rescue Hero trilogy and picks up where Special Rescue Team Winspector left of after the Winspector police team leaves Japan to fight crime in France.
Chief Shunsuke Masaki realizes he must create a new police team to defend Tokyo from crime and thus creates Solbrain – a high-tech special rescue force, expert in missions requiring rescue and firepower.
Solbrain’s leader is Daiki Nishio, a rookie detective who can use the Plus Up command in his car to transform into SolBraver. Other members are Reiko Higuchi, also able to use the Plus Up command to transform into SolJeanne, SolBraver’s female counterpart; and SolDozer, a yellow bulldozer robot.
Later in the series, the Winspector team returns to Japan and teams up with Solbrain for a three-part story (episodes 21, 22 and 23). From episode 34 on, Ryouma, the protagonist from Winspector, returns as a member of Solbrain, wearing a suit dubbed the Knight Fire.