An: basically after the twelve episode of the original story.
Far away from S-M-R world.
Flying through space is a spaceship know as Titan.
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Sitting on the command chair is Cyan who watch the fight between Soren and the two females.
Cyan: "That was a lame fight" he said but suddenly he got himself a idea. He tap a button which cause a face to appear on the screen.
???: "D here. What can I do for you?" a male voice spoke from the screen.
Cyan: "There is someone called Soren who used a Decade driver along with Super Red Sentai transformations" he said making the man from the other side of the screen to darkly chuckle.
???: "Then he will learn how powerful a true Kamen rider can be" he said.
At Japan.
Everything was peaceful but suddenly a massive shockwave in front of Union Academy cause a lot of buildings to be destroy. All the 'heroes' rush outside only to be horrified at the amount of dead bodies surrounded a creature.
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All Might: "Stop right there villain!" He said as Union Academy heroes get into an attack stance.
???: "you think you can beat me?" He said unleashing a deadly aura that cause the heroes to slam onto the ground.
Rias: "what is this?" She thought as she along with everyone else are completely terrified.
MD: "I am Monster Decade or MD for short" he said surprising them. "And I am here to destroy this academy" he said waving his hand which cause a purple glow around the academy. And like that Union Academy was gone which shock everyone.
An: basically a Thanos snap
All Might: "he might be more powerful than All for One" he thought.
MD: "Now what should I do to you" he said but immediately he was punch in the face by Soren (Decade) which send him into a building.
Soren: "I don't know who you are but your evil will not go unpunished" he said.
MD: chuckle darkly which surprised them "Not bad" he said walking out but what shock them was that he was completely fine.
Soren: "he is completely different from the enemies I fought" he thought.
MD: "However I barely begun" he said as he vanish but reappear infront of Soren.
Soren: "Woah!" He yell but he got punch in the gut and got slam into a wall however MD quickly teleport to a random student and kill that student.
MD: "weak" he thought before teleporting back to Soren then punching him in the chest.
Soren: "how is he this fast?" He thought as he try to defend himself but MD manage to kick Soren when his guard was down.
A hour of fighting and slaughtering small amount of random Union students later.
Laying on the group is Soren who is completely drain of stamina while the students and staff are completely knock out. However only MD remain standing but he sigh at how easy it was to beat Union Academy.
MD: "Gonna hand it to the kid to last a hour against me when I wasn't going all out" he thought but some clapping caught his attention.
???: "Fantastic as always MD" a male voice spoke causing MD to sigh.
MD: "Why are you here" he said turning to face someone.
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MD: "D-21" he said.
D-21: "Simple" he said pulling out a special card and giving it to Soren. "I am giving him a small boost the next time he fight" he said.
An: the card D-21 gave Soren is actually a Kamen Star+ Card which will give any Kamen Rider a boost of 50x in Strength and Speed.
MD: "Either way my job is done" he said vanishing while D-21 stay a little.
D-21: chuckle "The invasion might begun but the war has barely started" he said as he teleport Soren to the battleship girls base. After that, D-21 then summon a blank card which he uses to get Ddraig out of Issei body. The card then became a Kamen Red Emperor Rider Card.
Ddraig: "what the!" He said completely shock that he is no longer apart of the pervert.
D-21: "Don't worry I will find a worthy host but in the meantime" he created a weak version of the Red Emperor armor for the pervert. "Let see what you will do when you no longer a dragon but a lizard" he chuckled and vanish.
