As we all know, Kinji transformed into a youkai but thanks to his willpower, he reverts back to his normal self. That being said, his Nintality powers up, which transformed the Urasame youkai sword and a Nin-Shuriken into the Ninja Gekiattou and the Ultimate Nin-Shuriken. With it, StarNinger becomes Super StarNinger!
[Source: Shuriken Sentai Tumblr]