Kamen Rider Zi-O X Hyperdimension Neptunia Side Story: Kamen Rider Enix

This story is about a Dark Rider who wields the power of all 18 Dark Riders where she needs to prove that she's worthy in order to have their powers granted to her

S-Sha takes on the quest in order to prove her worth towards 18 Dark Riders in order to defeat the most powerful Dark Rider named Kamen Rider Neo Dark Decade, and the arisen threat named Another Dark Decade