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. He creates Solbrain – a high-tech special rescue force, expert in missions requiring rescue and firepower. Its 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.

Kota Mizutani, a 10-year-old boy whose health worsened after he saw a murder, is brought to Akiko's clinic by his mother Mariko. Kota says that two months ago, he witnessed a man in a park strangling a woman with a cord and was chased by the man afterwards. Hamada, who listens to his story along with Akiko, immediately performs an investigation but cannot find any traces of the crime. However, Kota's testimony gains credence when the body of a woman killed two months before is discovered on a construction site in Kawagoe. Acting on a tip from a citizen who says she had been wearing the same clothes as the victim, the police search the house of Kazuko Shimazaki, a photographer who is often absent. But when Kazuko returns from her trip with her assistant Hirano, it becomes clear the victim is a different person.