On Earth-1, there was a black ninja ranger named Kuroninja. Unlike Akuroninja, Kuroninja didn't have any red parts on his ranger suit. Kuroninja's style of ninjutsu was the traditional style of ninjutsu, which was also the opposite of what the Ninningers' style was. Unlike the Ninningers, who didn't hide, Kuroninja would hide in the shadows. He also used devices similar to Nin Shurikens, except that they were known as "Kuroninja Shurikens" because Kuroninja was the one who made them.

Kuroninja lived in a small house with Ran, the purple ranger of an evil Sentai team known as the Flowery Kunoichi Gang. Although Ran was part of a group of evil Rangers, Kuroninja saw the good in Ran, something that others couldn't do. Not only was Ran Kuroninja's roommate, but she was also Kuroninja's apprentice. Kuroninja used to have another apprentice, but she left and joined the Ninningers as their green ranger. Kuroninja also allied with the rest of the Flowery Kunoichi Gang, except for their olive green ranger, who Kuroninja hated. The Flowery Kunoichi Team used to be cats, but Kuroninja turned them into humans again by completing the Five Ninja Trials, which allowed him to earn his place among the Sentai Rangers as well. Sometimes, Kuroninja would assist other Rangers, especially the Ninningers. He also had an enemy named Anti-Kuroninja.

Anyway, Kuroninja was looking outside, when he noticed that there was someone in red fighting someone in silver. Then more silver people appeared, and so did a blue, yellow, white, pink, gold, and green one. The silver ones were fighting against everyone else. Kuroninja knew exactly who these were. The silver ones were Cyberninjas and Anti-Kuroninja, and the others were the Ninningers. Kuroninja headed for the area to try and help the Ninningers.

As soon as Kuroninja got there, he saw Momoninger, the pink ranger of the Ninningers, getting attacked by 3 Cyberninjas. The Cyberninjas fired laser beams at Momoninger. That was when Kuroninja jumped in front of Momoninger and got shot by the laser beams. The Cyberninjas took a closer look at Kuroninja, who turned out to be a straw dummy. The real Kuroninja was behind the Cyberninjas, and he sliced them, defeating them.

Kuroninja was about to help the others, but they had already defeated the Cyberninjas. That was when Kuroninja noticed Anti-Kuroninja attacking Shironinger, but trying not to kill her. Kuroninja threw a shuriken next to Anti-Kuroninja, who saw Kuroninja.

"Shironinger, run!" Kuroninja said. Shironinger ran away from Anti-Kuroninja.

Anti-Kuroninja then said "Kuroninja. You shouldn't have interfered. This is a fight between my group and the Ninningers!"

Kuroninja was about to fight Anti-Kuroninja, but then another silver-armoured Kuroninja with some red armour appeared. He was known as Cyber Kuroninja, Kuroninja's evil Interdimensional counterpart from Earth-9.

Earth-9 was a universe conquered by an evil empire known as Jark Matter. There were nine rangers in this dimension fighting against Jark Matter, but one of Jark Matter's scientists was creating his own soldiers, known as Neocyberninjas. One of the Neocyberninjas was created using the soul of the late Kuroninja. He then became Cyber Kuroninja and killed a Rebellion soldier from the Hakucho System, known as Sygnus. After getting killed, Cyber Kuroninja got the Hakucho Kyutama from Sygnus.

Cyber Kuroninja confronted Kuroninja and placed the Hakucho Kyutama in his Neo Cyber Adapter. He then got the Kyu Rapier, a weapon used by Sygnus and a green ranger from Earth-9 that Kuroninja was interested in. Kuroninja battled Cyber Kuroninja, who placed the Hakucho Kyutama on the Kyu Rapier.

"GALAXY!"

"Deneb Impact," Cyber Kuroninja said, piercing Kuroninja multiple times with the Kyu Rapier, as Cyber Kuroninja glowed in white light.

Meanwhile, Cosmo Royale, the host of Galaxy Warriors, was about to announce the next contestant, but then Akuroninja appeared on stage suddenly. Earlier, he noticed Cyber Kuroninja's fight against Kuroninja and noticed that he had the Hakucho Kyutama, one of the 3 most powerful Kyutamas when combined with the other 2. He was on stage to announce the Akuroninja Bonus Challenge, where if someone could get one of the 3 Kyutamas, they would win a green Ninja Power Star. Galvanax, the champion of Galaxy Warriors, accepted the challenge, but if he won, then Akuroninja was to leave the Warrior Dome. Akuroninja was very powerful, but Galvanax needed control over his show. He was the champion, after all.

After Galvanax left, Akuroninja opened a portal to send out one of his enforcers. Akuroninja was going to try and get the Ninja Steel Rangers involved.