This is a spin-off of Kamen Rider Ichigo and the Special Forces vs Union Academy. This story involves Ladybug and her quest for revenge on those who she believed they were her friends. Reason? They killed Michael Howard, also known as Spider-Man.
(Marinette is seen visiting her senpai's grave as she places a rose in his gravestone.)
Marinette: Rest in peace, senpai.
(Then Chloe and Jaune come in)
Marinette: What happened to Jaune, Chloe?
Chloe: Those bastard expelled him from the academy for letting Pyrrha die.
Marinette: I expected that from them.
Chloe: And that's not all. They somehow found out that you're the current Fall Maiden and sent some soldiers after you.
Marinette: Well... then it looks like a new battle is about to start. (her eyes glow) And I'm ready to face them.
Jaune: So am I. I am no longer part of that group of psychopaths.
Chloe: You can count on me too.
(At Daily Bugle, James Johan Jameson is seen announcing good news.)
J.J: The Union has finally been destroyed. The miraculous protector of Paris, Ladybug saved us all. She is now the Ultimate Miraculous Guarfian of the world. Everyone in Paris is seen cheering her up for her heroic actions.
(Meanwhile in the streets of Paris, a young boy named Marcell Henry is seen walking until he sees a black swordsman.)
Marcell: Kirito? What is he doing here?
Kirito: (notices his presence) I am here to take the life of a girl named Marinette DuPain Cheng.
Marcell: (draws a card) Over my dead body. Henshin.
Buckle: Kamen Rider Blade.
(Marcell then becomes Kamen Rider Blade.)
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Blade: Now, it's showtime.
(Chat Noir and Invincible are seen at the top of Eiffel Tower.)
Chat Noir: Are you ready, Mark.
Invincible: Ready. You know why?
Chat Noir/Invincible: Because we're the Dynamic Duo of Paris.
(At Unionverse, Ozpin is seen kicking All Might in the gut, making him vomit blood.)
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Ozpin: Unforgivable, Toshinori. This is unforgivable. You haven't only failed us, but you also made us lose most of our top students, besides letting Ladybug become the Fall Maiden, something I would never have found out if it weren't for James.
All Might: Sir... It was Raiden's fault... he...
(Ozpin hits All Might in the face with his Long Memory)
Ozpin: Silence!
(James Ironwood comes in)
Ozpin: There you are, James. Gather our forces. It's time we finished this game.
== Post-Credit Scene ==
(Emerald and Mercury are seen in the hospital, being watched by Nolan Grayson, also known as Omni-Man, and then Albedo and Whitley Schnee comes in.)
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Omni-Man: Whitley, prepare the new implants. It's time for the Omni-Man's faction to rise.
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Whitley: I'm impressed you didn't destroy this world even though you could have if you wanted.
Omni-Man: Because of Cinder, I had an explosive in my head. As a payback I am taking her faction from her.
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Albedo: Haven't you heard the news? Cinder Fall is already dead.
Omni-Man: I know. And I also know that my bastard son and that Catboy will try to protect the one who killed her.
Albedo: So our mission is to kill the Ladybug.
Omni-Man: Exactly.
(Then Whitley starts the implanting process as the screen fades out.)
