Well hello again! I have some news for you today. I have paused progress on two of my other fanfics and will complete this one first until then. And also I have created a new forum, it's a sword art online RP forum and yes, crossover OC are acceptable, meaning you can have an OC for naruto or WH40k and it will be accepted.

Anyways, doom and SAO do not belong to me for they belong to their respective owners. Hope you enjoy and leave a review if you want!

As Kazuto sat there against his 'sister's door, he thought about his life in the real world. From when he was 10, he found out he was not really part of the family. His sister really being his cousin. He also thought about the day when he finally woke up from the cursed game, sword art online. Then he got up and knocked on suguha's door and told her to meet him in a spot in the game.

Suguha pov:

She heard as Kazuto walked away to his room. She started to cry a bit but after a while she put on her headset and entered the game of Alfhiem online. When she opened her eyes again, she saw the gates to the world tree. She sighed as she was about to walk away until she almost ran into her friend, Nagata. They spoke for a while, but suguha tried to walk away to meet with Kazuto, that was until her friend suddenly expressed his love for her, and sadly for him he was punched and sent tumbling down the stairs. He had then walked back up, rubbing the back of his head. "Ow. I was only expressing my feelings for you" he complained, Suguha having a guilty face on her.

Later, suguha would be flying towards where kazuto said to go. He has sitting down, waiting for her, the doom slayer setting somewhere to the sides, waiting to watch the battle. "Kazuto, I want a rematch, let's finish what we started" she simply said. Kazuto only blinked a few times when he heard that. Suguha grabbed the handle of her sword and pulled it out, kazuto doing the same thing. They charged at one another, Kirito making a swing but missed due to Leafa jumping up and flying into the air. The black swordsman would fly up and charge after her, both climbing higher and higher into the air.

Leafa landed on a floating rock and help her sword shoved her head, Kirito landing on one beneath her. They stared at each other for a bit before suguha jumped down and started to attack kazuto, he would fly up and was about to swing. But as they got close, Leafa let go of her sword and started to free fall, the black swordsman was taken aback by this but caught her anyways. They spun around for a bit, speaking to each other and apologizing like they do in every other movie/series nowadays.

Doom slayer pov:

he looked up at the two spinning around in the sky. They then came back down soon after and went to the world tree where nagata would be waiting for them. "Wait, so what are we doing?" He asked. "4 players are going to raid the world tree" suguha said. Her fried didn't seem to like that idea. The black swordsman called out to the little fairy, to which she appeared in a pink light and landed on his shoulders. "Hey Yui, you got any info on these guardians?" He asked. "Yeah, they're stats are low, but there's just too many of them" she answered, Vega following up with, "meaning they add up to one unbeatable boss".

"yes, but don't forget your skills and XP are really high. So many with a burst of speed you can smash right through them" Yui answers. "Indeed, it can provide a very good chance of at least 49% success rate. And with the slayer at your side, it is very well possible" Vega adds. Kirito nods and looks at everyone. "This isn't your fight, but I'm really gonna need your help to get through. But times running out, so we have to go now." Kirito said with determination.

"don't worry, I'll help. Let's see that game face, huh?" She said as she playfully elbowed her green haired, nerdyish friend. "Well, I guess I don't have a choice considering we are destined to be together for-" he never got to finish as he was hit in the back of the head by the blond fairy. "Ok! Don't talk stupid." the slayer watched with a small smile. And as they put there hands in the middle of each other, the slayer put his own heavily armored hand in too as they got ready to enter the tree once again.

Inside the tree:

Kirito began to fly up, waiting for the guardians to come out and attack him. The slayer followed, riding his dragon so he could. He loaded two rounds into his famous super shotgun, and gave a thumbs up to Kirito, who gave a determined look back. Soon enough, the guardians started to emerge from the walls, forming a barrier at the gate at the top. They were like mosquitoes, pests but can be dangerous with their diseases, only these didn't have them, instead they had swords and bows.

The slayer rose his dragon towards the wall of mosquitoes and got out his ballista, it charged an shot a large red wave of energy at them, slicing any and all that got in its way. Kirito charged in as well, slicing any whom got in his way, yelling in defiance at the army that somehow didn't crash the server. Leafa and her friends stayed back, making sure kirito stayed alive using healing spells. As they watched the doom marine's health, they saw that with each 'glory kill' he gained health, and settled an enemy on fire and killing it gave him a green bar. They did not know what it meant but scratched it off as another special health bar, which was correct.

After a while, it seemed as if they got no where, and so Leafa's friend flew up and started to chant a spell. "No you dummy, what are you doing?!" She yelled. He did not listen as he continued to chant, now realizing what he was doing, suguha's eyes widened and she whispered to herself "he's performing a dark magic spell". He quickly healed Kirito some more as she watched her school friend finish chanting, exploding into a giant ball of fire. He too disintegrated as he exploded into a ball of fire, leaving a gaping hole in the wall of guardians.

After a while, the guardians started to surround the blond fairy as she tried to heal Kirito to full health. She gritted her teeth ash she looked at them, they raised their swords preparing to strike, until a war cry sang out from below. The stopped and looked down, seeing...

Author:

haha, cliff hanger. Anyways, sorry for ending it so soon, I just needed this to be posted, and I do apologize for the long wait, but I will finish this soon.

No, the demons will not invade the real world just so you know, I'll answer more in the next chapter, plus I'm probably gonna make a Q and A forum right after this.