Disclaimer: I don't own Accel World, Sword Art Online, or Kamen Rider and they belong to their respected owners.
Hatena Bugster fired a laser from his staff creating explosions around the group. They all groan as only two individuals stand up, Kirito and Arita.
"Kirito, here!" Arita handed Kirito a Gamer Driver and Gashat.
"A Gamer Driver? Didn't know you had extras." Kirito says.
"It belongs to a user called Genm," Arita says
Both Arita and Kirito placed the Gamer Driver on the waist making the Driver create a belt around their waist.
"Here use this!" Arita gave Kirito, Genm Gashat
As soon as Kirito took hold of the Gashat, it began to glow before it became a different Gashat. Arita and his friends were surprised to see the Gashat changed. Kirito then clicked the Gashat's Player Switch.
TAIYOU NO AGITO!
An orchestra sound was heard, followed by a game screen of the Taiyou no Agito game that appeared behind the Kirito. It had the image of Kamen Rider Agito and the game's title.
"Agito? That's new." Kuroyukihime commented.
"We'll ask questions so let me join you as well!" Arita took out a new, bulky orange-cobalt Gashat with the size of two Gashat slots and pressed its button.
MIGHTY BROTHERS XX!
"Henshin!" Arita inserted the Gashat into the Game Driver.
DOUBLE GASHAT!
GACHAN! LEVEL UP!
Arita chooses a thumbnail that soon went through him, engulfing him in orange and cobalt pixel haze. The thumbnail also changed into a big faceplate similar to his Level 1 form, only that it had a differently-styled spiky hair ornament with orange on the right and cobalt on the left.
MIGHTY BROTHERS! FUTARI DE HITORI! MIGHTY BROTHERS! FUTARI DE VICTORY! X!
The faceplate first appeared to be split apart in half before combining to each other and later to the pixel haze. The haze dissipated and revealed him to be in another bulky 'clown-suit' armor with a different chest plate. It had orange, yellow, and blue keypads instead of the original buttons and had more health bars. Ex-Aid then completed his Level X transformation as he opened his bichromatic digital eyes with respective colorings.
"Woah, this looks different from Mighty X.," Silica says.
"It just changed to a new color," Lisbeth added in.
"You can say it's my Upgrade Form," Ex-Aid says.
"So this is the power of level 20, incredible," Sinon observed.
"My turn." Kirito twirled his Gashat before he inserted it into the Gamer Driver's right slot. "Henshin!" Kirito inserted the active Gashat into the right Gashat Slot.
Several game character thumbnails spun around him. Each had different Chibi helmet designs with some unique hairdos adorning it. Kirito then retracted his left hand to the left, selecting his designated thumbnail as it aligned in front of him.
GASHAT! LET'S RIDE! METCHA RIDE! MUTCHA RIDE! WHAT'S YOUR RIDE!?
Kirito now had a chibi look too with his body being black and yellow and with a bit of gold. His faceplate was a golden faceplate that was connected to a set of golden horns that resembled European dragons with a small sapphire gem connected to a silver stripe running down the center of his helmet with large red compound eyes.
I'M A LEGEND RIDER!
He was now Kamen Rider Genm Agito Gamer Level 1.
"Nii-san became a chibi as well!" Leafa exclaimed.
"A Legend Rider? Just who is Agito?" Takumu pondered.
"I wonder too, but come on Kirito! Let's end this Bugster!." Ex-Aid replied.
"Hai! I'll follow your lead!" Genm right beside him.
The battle began with Ex-Aid charging at Hatena Bugster first. Hatena Bugster held up its staff and thrust it at the Rider, only for him to jump it out and deliver a ground pound that kicked the Bugster's head and pinned the Bugster to the ground. Genm began his assault by jumping and stomping Hatena Bugster much like in the manner of action-platform games. Ex-Aid also didn't hesitate to use his own body to slam on top of Hatena Bugster as his weight was enough to smash its head. After Ex-Aid body slam, Genm set his sights on Hatena Bugster. Hatena Bugster let out more lasers from his staff making Ex-Aid and Genm jump back.
"Do you really think you can just charge up at me?" Hatena Bugster growled.
"Let's add one more player, shall we?" Ex-Aid remarked as he closed the Gamer Driver's cover and rolled both of his arms in the air. At the same time, the giants were about to hit the Rider with their fists. "Daaaaiiiii~ Henshin!"
GACHAN! DOUBLE UP!
The moment the fists were about to hit him, a Gashat gate went through him and his Level X Armor exploded to pieces and released a two-pixel haze that split apart from one another. As usual, the orange was on the right, and the cobalt was on the left.
ORE GA OMAE DE! OMAE GA ORE DE! (WE ARE!) MIGHTY MIGHTY BROTHERS! (HEY!) XX!
The faceplate parts were also relocated as the two haze began forming new armors of their own and delivered Rider Kicks to the Unions to drive them away. The haze landed and revealed what completely became the most shocking and bizarre view even to the Creations.
Ex-Aid has literally split apart into two individuals. Both of their armors had a complimenting color mixture of orange and cobalt that went to their jumpsuit parts and accents. The right orange one had the faceplate half on his right shoulder and the left cobalt side of his hair part was seemingly combed back as opposed to his right orange one. The left cobalt one was simply a palette swap of the former, with the faceplate half on his left shoulder and the right orange side of his hair was the one that was combed back.
They were Kamen Rider Ex-Aid Double Action Gamer Level XX.
"Let's clear it together with super co-op play!" The two Ex-Aids declared in perfect sync as the Double Action Gamer Level XX was completed.
"He split into two!" Klein pointed at the two Ex-Aids.
"Arita-san sure is amazing." Agil looked at the two Ex-Aid in awe.
"That's Arita for you!" Chiyuri sounded proud of her friend being praised.
Genm followed Ex-Aid's lead as he opened the Driver's Actuation Lever and shouted, "Dai-Henshin!"
GACHAN! LEVEL UP!
Genm's whole body began to shine and a bright light covered his body.
FLAME! STORM! GROUND! BURNING-SHINING! TAIYOU NO AGITO!
A digital screen box displaying a hologram of Rider armor inside a screen started to pass through the Chibi Rider.
As the light died down and the screen box is gone, Genm was now in a black-colored bodysuit with grey lines on his sides going down to the thighs angling like a circuit. Black arm sleeves from the elbow down with purple armor bands on the upper arm and wrist with yellow armor plates on the forearm and hands. Same thing on the legs, black sleeves with purple bands and yellow plates on his knees and silver plates on his shins. He has purple sneakers and black shoulder armor. His chest armor is silver with a yellow collar with a yellow breastplate on both sides. On his back was a golden faceplate that was connected to a set of golden horns that resembled European dragons with a small sapphire gem connected to a silver stripe running down the center of his helmet with large red bug-like eyes and a silver mouth guard as well. His helmet was black with a silver mouth guard and had a golden faceplate that was connected to a set of golden horns that resembled a European dragon with a small sapphire gem connected to a silver stripe running down the center of his helmet with large red bug-like eyes and a silver mouth guard as well. There were the usual silver goggles and chin guard on the faceplate. This is Kamen Rider Genm Agito Gamer Level 2.
"Now that we level up, why don't we end this with a finisher?" Ex-Aid says.
Kirito smiles under his helmet and nods, "Take the lead."
Both then proceed to Ex-Aids closing their Actuation Lever activating their finisher.
GACHON! KIMEWAZA!
Ex-Aid Level XX R's right foot started to glow blue pixel particles, while Ex-Aid Level XX L's left foot started to glow orange pixel particles.
GACHAN! MIGHTY DOUBLE CRITICAL STRIKE!
Ex-Aid Level XX R and L perform a series of kicks at Hatena Bugster, before transforming back into Level X, who double punches Hatena Bugster in the air, then separates back into the Level XX R and L, both of whom would later double kick at Hatena Bugster.
With Genm, he inserted the Gashat into the Kimewaza Slot, Genm then triggered the Critical Strike finisher based on that Gashat, after pressing the button next to the slot twice.
KIMEWAZA! TAIYOU NO CRITICAL STRIKE!
Genm starts channeling power into his legs from the Agito symbol, Gemn then jumps up as he executes an incredible raw power sidekick.
Genm's right foot made contact with Hatena Bugster's face as the Buster tried to hold back the attack but was too weak from Ex-Aid's finisher before being overwhelmed by Genm's kick as the Rider kicked through the Bugster and left a 'PERFECT!'.
GAME CLEAR!
Everyone cheered on both Ex-Aid and Genm's victory. But Ex-Aid does wonder how Kirito was able to create Taiyou no Agito Gashat from the Genm's Gashat. Is there some kind of connection?
AN: I was just going to do Ex-Aid Double Brothers but when I hear Accel World and SAO had a crossover I just had to try to make a one-shot. If you guys didn't know but I did a Kirito become Agito Shining Form and thought of having Kirito use Genm's Gamer Driver and have him use the Taiyou no Agito Gashat. So, give me your thoughts on what you guys think on this one-shot.