The Ninja Steel Rangers were busy fighting the ghost monster who was sent by Sledge to retrieve the Ninja Power Stars. This ghost monster was easily defeated by the Ninja Steel Rangers, until he released his secret weapon. The ghost monster spat out some kind of pink ooze at the Ninja Steel Rangers, paralyzing them. Now, they couldn't move. The ghost monster then took the Ninja Power Stars easily.
When the ghost monster returned to the ship, Sledge was happy to see that all the Ninja Power Stars were there. But then Anti-Kuroninja showed up, with his Cyberninja bodyguards. He took the Ninja Power Stars to Cyber Island, the main base of the Cyberninja Tech Company, which was partnered with Anti-Kuroninja. Unfortunately for Anti-Kuroninja, he was unable to use the Ninja Power Stars, because they were covered in pink ooze. Anti-Kuroninja decided to search for some hardware stores that sold anything with the power to remove sticky substances.
Meanwhile, the Ninningers were watching the news, and noticed a monster similar to one of the Yokai they fought before was attacking the Ninja Steel Rangers. Suddenly, Kuroninja entered the room and apologized. The Ninningers had no idea why Kuroninja was apologizing, but Kuroninja said that he lost all the Nin Shurikens. Kinji realized that Luna, or Midoninger, wasn't there, and still had the Midoninger Shuriken. Unfortunately, Luna was in Egypt, so she couldn't help the Ninningers. Kasumi asked Kuroninja if there were any clues to who stole the Nin Shurikens. Kuroninja then explained how he saw some yellow fibres on the floor the night that the Shurikens were stolen.
Later, Kasumi prepared some lab equipment, including a microscope. Kuroninja placed the yellow fibres on the microscope and found traces of something. Kuroninja used a gear-shaped shuriken he had, known as the Profiler Shuriken. Kuroninja spun the Profiler Shuriken, which revealed that the stuff on the yellow fibres belonged to a cooked land snail. Since there were traces of a cooked snail, this meant that whoever stole the Nin Shurikens worked at a French restaurant, since there was a French dish known as escargot, which contained snails. There was only one French cafe nearby, so Kuroninja and the Ninningers decided to head there, in case there were more clues on where the Nin Shurikens were.
The Ninningers and Kuroninja went to the cafe and sat in different locations. Kasumi and Kuroninja sat next to each other, Fuuka sat far away from Kuroninja's table, but in a place so she could still see Kuroninja, Takaharu went to use the washroom, and the rest sat at a table near the washrooms. A serious-looking man with black hair was cooking the food and washing the dishes, while a girl with short, brown hair was taking orders. She looked very familiar to Kuroninja, as if he had seen her before.
Kuroninja and Kasumi ordered some food. The girl serving the food "accidentally" spilled water on Kasumi, so Kasumi had to go to the washroom to dry up. Kuroninja ended up eating alone. After eating, he went to the washroom to wash his hands, but while he was going to the washroom, he thought he saw the Aoninger Shuriken in the kitchen. After washing his hands, he decided to take a closer look, but then the guy cooking the food gave Kuroninja a look, kind of asking Kuroninja "Hey, what are you looking at?" Kuroninja didn't want to start a fight with the guy who cooked the food, so he slowly went back to his seat. Kasumi went out of the washroom to eat, but her food was cold.
A few minutes later, Kuroninja and the others were kicked out of the restaurant by someone who looked like the owner, a guy with light brown, curly hair, but they weren't given the reason why. The good news was they didn't have to pay for the food. The bad news was that neither Kuroninja nor the Ninningers learned anything, except that the restaurant had very bad service. But then Kuroninja remembered something. He remembered why he recognized the girl working at the restaurant. She looked like one of the Lupinrangers, and Kuroninja had met them before.
The next chapter will be a flashback to how Kuroninja and the Lupinrangers met.