AN: With how my first Ryuki one-shot turned out with few reviews… I decided that I might do this in the place to see if it will be anything different from before.

I don't own Kamen Rider Ryuga or Infinite Stratos as they belonged to their respective users!

Kamen Rider Ryuga- Black Dragon's Advent War

A door was closed as someone come into the quiet apartment. It appeared to be a young man with black hair and matching black eyes and pale skin. He was wearing blue trench coat with red scarf. But what is noticeable was the permanent frown stick upon his face.

It wasn't long until he took out something from his pocket. It was a rectangle box with a black dragon head symbol on it.

"Any wish will be grant to the last Kamen Rider who wins the Rider War. Even if it means to erase IS from the face of the planet." The voice of Shiro Kanzaki was ringing in his mind.

It won't be long as Yuuma aware of the upcoming tournament. Even since that day where everyone that he once trust turned their back on him as they all believed that he was the rapist. He thought of lost all sanity if it wasn't for that man shown up and cleared his name. But his reputation was already destroyed and this left Yuuma with nothing but angst. All of this happens because of female supremacy appeared around the world… started when exoskeleton known IS shown up few years ago.

"Don't worry, Yuuma. Once we win the Rider War, you'll finally get the wish to regain your life in a world without Infinite Stratos." A voice said as Yuuma looking at the face of black, metal Chinese dragon in a nearby clock.

Whether or not the wish was real for the victor of Shiro Kanzaki's tournament. He owe Kanzaki that much for helping him when no one helped him, that is why he joins the Rider War. This was his own shot of getting everything back before his life went to ruin in the first place.

"I know. But we'll still have to wait until rest of the 13 Riders to appear. That is when we can give it our all." Yuuma whispered before he hears a familiar ring in his head.

"Let's go, shall we?" The Contact Beast asked.

Yuuma soon approached a large mirror nearby and stares back at his reflection.

He placed his deck out and a belt soon formed around his waist.

"Henshin…!" Yuuma shout after sliding the deck into his belt.

Three mirror silhouettes of armor appeared and merged over him. His body was now covered by some kind of black armor that had gold lines running across it while he wore a black bodysuit underneath it. On his left arm was a gauntlet that had a black dragon's head with red eyes on it. His helmet had piercing red eyes that were covered by a black horizontal grille with a black dragon emblem on the top of his head. Black sockets were placed on his shoulders and his heels, as if they were meant to be locked into something, also on the edges of his armor were golden lines accenting the edges of the armor. He wore a silver belt with the Advent Deck in the center of it, except it now had a black dragon's head on it.

This is Kamen Rider Ryuga.

He soon jumps straight into the front mirror on his own.

Ryuga landed into a hallway filled with mirrors everywhere and he soon saw the Ride Shooter, he gets into the Ride Shooter and rides to the source of the sounds. Flying above him was none other than DragBlacker by his side.

It wasn't long until Ryuga got out and finds himself in a reversed version of the Infinite Stratos Academy. Ryuga cannot help feeling angry at the place before he soon hear the sound of blast and decided to investigated the source of the sound.

It wasn't long until he stumbled upon a IS user who tried to fend off against a white humanoid jellyfish monster known as Brobajell. Ryuga choose to stay where he was as he know how things will turned out especially for those who living in the outside world.

It wasn't long until IS user's arms starting to degenerate rapid than before and Brobajell used this chance to use its tentacles to catch her and electrocuted her in the process.

"So much for the superior of female weapons…" DragBlacker commented.

Ryuga didn't flinched as he took out a card and inserted to his gauntlet like device before closed it.

"ADVENT!"

DragBlacker appeared and breathed black fire towards the Brobajell, which send the mirror monster flying backward. Ryuga soon got out another card and inserted to his Black Drag-Visor, closed it.

"SWORD VENT!"

It wasn't long until a sword dropped into Ryuga's hand. The sword looks like a black dao sword that resembled DragBlacker's tail.

Ryuga soon charged against the Brobajell. The mirror monster tried to grabbed Ryuga with it's tentacles but Ryuga avoided them and got closed to them. Ryuga soon slashes Brobajell in the chest twice, and sent it skidding backward. The Brobajell got back up but Ryuga wasn't finished yet and keep on slashes it to further damage the mirror monster. After seeing it rolling across the ground, Ryuga soon picked out another card from his Advent Deck. The card has the picture of the same emblem on his deck. He placed it in his Dark Drago Visor and closed it.

"FINAL VENT!"

DragBlacker soon appeared and circled around Ryuga as the Rider got into a martial art position. Ryuga levitated as his Contract Monster continued to fly circles around him. When he was high enough, Ryuga got into a flying kick position. DragBlacker was now behind Ryuga and breathed a large blast of black fire from his mouth that passed right through Ryuga. Not only it launched the airborne Ryuga, but also caused black fire to gather around his legs, making Ryuga look like a black comet.

The Brobajell tried to escape but some of DragBlacker's black flaming paralyzed its leg. When Ryuga collided with the Brobajell, it causing a massive explosion in the process. The explosion faded, leaving an undamaged Ryuga and an orb of energy dropped by the destroyed monster.

DragBlacker flew in and absorbed it and let out a content growl.

"It's a long day, we should head for sleep before going on hunting again and prepared for the Rider War." Ryuga said.

"Can't wait…" DragBlacker said in Ryuga's mind before leaving through the sky.

Ryuga soon leave the academy ground by going through another mirror.

AN: That is all I have for this one-shot. As for why I choose IS because it will be a clash between science and supernatural. As for why I picked Ryuga because why not? Not to mention I want to do something different. I'm certain that there are dissatisfied people with how female supremacy in society and will eager get their hand on a wish in order to change the entire world. Anyway, be sure to review or message me for any questions, comments, or concern. And don't be afraid to look at my other stories.