The Ninningers and Ninja Steel Rangers were tricked into fighting each other again because the Ninja Steel Rangers thought the Ninningers were working with Galvanax. They were also tricked by Akuroninja into believing that Kuroninja would turn evil and destroy the world in the future. The Ninningers, however, had no idea why the Ninja Steel Rangers were fighting them and didn't really fight back that much.
That was when Kuroninja appeared and attacked Galvanax, because he thought that Galvanax was the one tricking the Ninja Steel Rangers and the Ninningers into fighting each other. Galvanax said he was only there because Akuroninja stole the Warrior Dome. Kuroninja then realized that Akuroninja was the one who tricked the Ninja Steel Rangers, and he wanted the 3 Kyutama that Kuroninja was after. Kuroninja realized he needed to get the Hakucho and Koto Kyutama before Akuroninja got them.
Meanwhile, Akuroninja left the Warrior Dome because he believed that Galaxy Warriors was useless and couldn't find the 3 Kyutama that he was looking for. That was when one of his Enforcers appeared and told Akuroninja about what he saw when on Earth-9. A Kyutama was almost unlocked by Kuroninja. Akuroninja realized that Kuroninja had the Koto Kyutama. Because of this, Akuroninja left to take down Kuroninja before he could unlock the Koto Kyutama.
Kuroninja had convinced the Ninningers and Ninja Steel Rangers to stop fighting each other, and he had also convinced Galvanax to leave. That was when Cyber Kuroninja appeared, along with Anti-Kuroninja. Kuroninja challenged Cyber Kuroninja to a fight to get the Hakucho Kyutama.