DOOM Mod Oneshots

A/N: I'm back with another oneshot. This time, it's a crossover between the H-Anime Taimanin Asagi (Anti-Demon Ninja Asagi in English) and Project Brutality v3.0! Now, given how most Doom mods are simply gameplay changes (such as adding additional detail to your HUD or replacing your arsenal and the enemies you face) and that the official Project Brutality campaign, Project Black Mass (The only map I've seen of it so far was UAC Prison Lab 666, so I'm not gonna use that campaign as the base for Project Brutality in this oneshot), is yet to be finished, I'll instead use Brutal Doom's Extermination Day Campaign as the storyline Doom-wise.

[EDIT 08-06-2021 A.D.] After playing a lot of Action Taimanin (Yes, there's a game for this Eroge and it's for free on Steam), I am more familiar with the apparent lore the Taimanin series has. It's honestly like DOOM, you think it's all so simple and then BOOM! Motherfucker hits you over the head with entire icebergs of lore.


[Oneshot 03: Almighty Demon Hunter and the Doomed Marine]

Date Started: 08-01-2020 A.D. (The original Harry Potter X VietDOOM crossover) | (Never got around to writing that Mad Father X Doom Incarnate crossover I planned) | 02-12-2021 A.D. (The current Taimanin Asagi X Project Brutality crossover)
Date Finished: 08-13-2021 A.D. (Yeah, it took that long for me to get this thing done)
Date Edited: 08-15-2021 A.D.


[Igawa Household | Japan | 2075 A.D.]

This could not be happening and yet it was. Somehow, she and her boyfriend had been ambushed in their own home.

"Come over here, Kyousuke," Oboro's voice rang in her boyfriend's head, sounding like honey to the ears of those who listened. Asagi could not move even an inch. Whatever magic Oboro had, it stopped her from effectively moving. At the corner of her eyes, Asagi could see Kyousuke moving towards her, but she could see signs of resistance coming from him. Kyousuke limped over to Oboro like a zombie, his eyes dead to the world. Asagi gritted her teeth. This feeling of helplessness was enough to put her in a bad mood and the concern for her lover only made it worse.

What other tricks did this traitorous bitch had up her sleeves?

"How does it feel, Asagi~?" Oboro taunted, licking her lips in delight. "To be helpless and unable to help someone you hold so dear to your heart. It must be a frustrating experience." Asagi simply glared at what used to be her friend.

"Now then," she gestured to the demons accompanying her. "Have fun, boys!"

Asagi's eyes widened as the demons surrounded her. Onis and Ogres, high ranking ones at that, got closer to her. At this distance, the combined stench from them was overwhelming her senses but years of training allowed Asagi to keep her disgust down. It was not noticeable to them, but it was clear as day to Oboro, who simply chuckled at her attempt to appear calm.

"It's no use, Asagi-Chan! I know how you're feeling deep inside!" Oboro cackled like the madwoman that she is.

One Oni stepped closer towards her, his breath nearly making her reel back in disgust. The Oni reached out for her shirt, the intent to rip it off clear to all conscious.

Just as his fingers touched the fabric, it had happened. From the window, they saw the flash and later on an explosion roared out.

Its sudden occurrence took everyone off guard.

"What the?!" Oboro turned to the shinobi that accompanied her. "Investigate that noise!" They wordlessly nodded and disappeared in a cloud of smoke.

"Now…" she calmed down and gave a dark smile at Asagi. "Where were we?"

She made to move towards the subdued Taimanin when they heard screams coming from outside the house.

Those were the same shinobi that Oboro had just sent out. What was going on out there? And what was with the gunfire? Surely the authorities, weak as they were, not already here?!

Before Oboro could ponder further, the front door suddenly was blow off its hinges! Splinters and shrapnel showered the area, hurting most of the Onis and Ogres. Oboro was just quick enough to avoid having her body filled up with splinters and shrapnel. She snarled and extended her personal claws out to face her attacker.

The person that had stepped into her view was not what Oboro had expected. She had expected someone to be defending the Igawa household, yes, but she had expected someone local, such as Asagi's bratty little sister Sakura.

This person was most definitely not a local. This was not the lithe yet busty Igawa Sakura. This was a wall of muscle armed to the teeth.

He was tall, almost as tall as the Onis and Ogres that she had brought. His face was concealed by a dull gray helmet, its wide visor a dark aquamarine tint that hid his eyes from everyone. His torso was clad in dark green armor, the design unfamiliar to her, with an opening on the abdomen that exposed his rather well-defined abs. Past the shoulder armor, his arms were bare, save for the black gloves and dark green forearm gauntlets, the left one having an extra attachment that she could not properly discern the function of. His lower consisted of a pair of drab green pants and dark gray knee-length armored combat boots.

In one hand was a sub machine gun, the design very much an American weapon. Judging by the smoke emanating from the barrel, it had been the culprit of the gunshots.

In the other hand he was holding a rocket launcher, the design rather alien to her as the rest of him. And it was emitting a bright green laser, aimed right at her chest!


He didn't know what exactly transpired between him killing that giant goat demon motherfucker and ending up in what looked like a Japanese neighborhood. He vividly remembers launching one last BFG Ball straight into its forehead and the goat demon exploding like a nuke shortly after. The next his eyes opened, he found himself at the side of an empty street, the design of which reminds him of the Japanese suburbs.

Confused, he wandered aimlessly through the suburbs. He hoped that, if he wandered long enough, someone would notify the authorities and he would be well on his way back to UAC territory.

That plan had been shot to Hell when he came upon a rather alarming scene.

Demons had surrounded a house. He was aware that while most of the invading force were on America, the demons had other countries on lockdown as well. Still, one would think that, with the death of the big goat, the rest would follow immediately. It seems these ones did not receive the memo.

Out of the kindness of his heart, he'll give it to them one 80mm rocket at a time.

Lining up the sights of his UAC Guided Rocket Launcher on the demon that was relatively closest to him, he fired. They did not have the luxury to react, the rocket had already slammed right into one of them, exploding and sending shrapnel in a wide radius around the blast zone.

That grabbed their attention really good, as they now noticed the marine that decided to crash their party.

They snarled at him and brandished their weaponry. Fitting the surroundings, these weapons looked like something he had seen in Japanese museums in the past.

Cute, but it will take more than some swords and axes to strike him down.

For the first time since he had gotten out of Hell, he bellowed a wordless challenge and fired another missile.

Again, they could not properly react to a 80mmX152mm high-velocity rocket meant for taking down fast-moving aircraft and were vaporized as a result. The blast only took out two of them but no matter.

It was more fun to do it with other weapons.

Reaching into his hammerspace inventory, he pulled out a licensed copy of the Magnum Research Desert Eagle made by the UAC and fired at the oncoming demons.

He did not stand still either, he was strafe-running around them and narrowly avoiding their strikes as he gave them some new 0.50 Action Express holes in them for their troubles.

He slid under a demon's swing of its axe before firing back, blowing apart its ugly head in a gloriously bloody piñata-like display. Reaching the end of his slide, he quickly got up to his feet and swapped out to a more appropriate weapon.

The UAC M17 SMG, another UAC licensed weapon, this time a copy of the TDI Vector SMG with a few changes to the design, belted out its payload, striking the demons with 0.40 S&W Hollow Point rounds. The bullets, upon penetrating their skin, expanded and caused much internal damage to them, making for rather spectacular explosions of blood and flesh, small they may be.

These demons fell quickly, and the marine quickly reloaded the SMG.

He stepped closer towards the house with the intent of finding out exactly what makes this space special compared to the other houses. Speaking of houses, the neighbors should be complaining about the noises right about now. Good, the sooner he can contact the local authorities, the sooner he can get to the UAC.

Then, before his very eyes, appeared actual ninjas from clouds of smoke. He blinked once, trying to see if he was not hallucinating but they really were in front of him.

Five ninjas stood in front of him, wisely spread out so that meant that netting more than one kill with a rocket would be tricky.

These fellas do not look like the type to help him, judging by their stance and overall aura.

More bodies need to be dropped; it seems. Fine by him, he never was the diplomatic type anyway.

He fired a rocket at them. As he had expected of ninjas, they dodged it and the rocket harmlessly slammed into the front of the house, blowing off the door from its hinges.

He dodged as one swung their sword at him and he retaliated by bursting away with his SMG. The ninja died near-instantly, as their clothing and lack of armor meant that the rounds were a lot more effective compared to the thicker-skinned demons from earlier.

He backflipped away when three of the ninjas decided to gang up on him as payback for their fallen kin. One, a woman, came at him with twin daggers with the intent of filleting him alive.

He does not appreciate that, so he shot her head full of lead as a response.

Two down, three to go.

He ducked underneath the swing of one ninja's chain scythe thing, but he got smacked by another ninja's club. He gritted his teeth.

Don't these morons know how hard it is to maintain armor?

He kicked the offending ninja in the gut before firing another burst of pistol-caliber fire into their gut, blowing out their backside. Wasting no extra time, he shifts his aim to the other ninja and fired. This ninja dodged as best as he could but eventually the bullets got to him in the end.

And then there was one. The marine calmly reloaded his SMG as the last ninja, the only other woman in the group, leapt high into the air. Her weapon, a large blade, came at him at high speeds on account of the weight and gravity doing most of the job.

At the last possible second, he rolled to the side, the large blade harmlessly making a fissure in the street. The blade was stuck deep into the asphalt and the marine fired at the last ninja before she could pull it out, the 0.40 S&W rounds blossoming little explosions of flesh throughout her body.

She was dead long before she dropped to the ground.

With the last threat outside dealt with, the marine turned his attention to the occupants inside the house.

He saw a bunch of demons surrounding someone, who that person was he could not properly identify as their size blocked any significant feature of their victim.

He saw a woman with short pink hair wearing the lewdest attire he had ever seen any ninja would wear. He could quite literally see her rather bountiful backside and her ass. She looked to be the ringleader of this circus of freaks.

And she had an average looking man wrapped around her finger. Not literally, but figuratively. Judging by the dull eyes, he was not doing this out of his free will.

She spoke something to him, but he could not really understand with how fast she was speaking. He could tell, however, that there was hostile intent in her voice.

And judging by how she was pointing those claws at him, she wanted a piece of him personally.

Underneath his helmet, the marine grinned before firing a rocket at her.


Oboro got out of the way of the rocket, the projectile sailing past her and into the house. If it killed Asagi, it would be ideal in Oboro's eyes although she would be damned if she did not make her suffer before dying.

She gritted her teeth as the damage that this intruder had done to her troops was revealed. The street in front Asagi's house was a warzone.

"Attack! Strike him down and bring me his head!" she commanded and the Ogres and Onis obeyed. They rushed at the man only for their bodies to be blown up by that damned rocket launcher of his.

She growled lowly before rushing at the man herself.

To her surprise, the rocket launcher disappeared, leaving only the SMG in his hand. The man wasted no time at all and fired right at her.

She cursed under her breath and dashed away, the bullets harmlessly sailing past her and striking the house instead.

The soldier moved rather fast despite his size, easily evading what her shinobi had as weaponry.

There were a few hits on him, but that just served as to anger him and fire enough bullets to blow out their backsides. That made the surviving shinobi keep a good distance back and away from his direct line of sight.

He was busy dealing with her minions. Good, she thought. It gave her an easy opportunity.

She lunged and her claws sunk into the man's leg. The man grunted and, with surprising amount of strength, swatted her away.

"What the hell?! How strong is he? I didn't detect any Taima Particles from him at all!" Oboro snarled at the man, lowering her posture until she was very close to the ground before lunging at him at supersonic speeds.

The man barely dodged her strike, rolling to the left and making Oboro sail past him.

The Traitor Taimanin landed on her feet and quickly turned to face him.

The SMG was gone from his hands and in its place was a strange double-barreled gun. No matter, whatever gun he had would not be enough to strike her down.

"You're good," she spoke. "But your little toys are no match for me!" The man did not reply, only tilting his head to the side slightly at her. She smiled despite the rage inside her before blurring out of his vision.

She reappeared high above him, claws ready to strike him down.

The man reacted quicker than she had anticipated and had begun firing his weapon at her. She twisted and rolled to avoid being hit by any of these projectiles.

Though fast for most, Oboro could easily see the projectiles for what they were.

"Nine-Inch Nails?!" her eyes widened at that. The nails were indeed nine inches in length, segmented at certain areas for storage reasons no doubt, and the business ends were tipped with serrated blades.

These nails were meant to rip her to shreds. This man was dangerous, no doubt about it.

It was time to get serious.

She swung her claws at him and the man, surprising her once more, blocked with an arm blade that was mounted on his left forearm. He swung the left arm to the side, throwing her off far from him.

She landed on her feet again and she saw that the man had swapped to another weapon.

It was a design she was not familiar with. It was sleek yet blocky, with blue lights going up and down the gun's frame. Judging by the electronic whirr, this was an energy weapon of sorts.

The front of the weapon split up into a trident and Oboro was glad she dodged as a beam of lightning shot out from the gun and incinerated the wall behind her.

The lightning beam stopped as the man gave pursuit, the weapon still trained on her.

She gritted her teeth at this and sought to remedy by any means necessary.

As she was dodging the man's lightning gun, Oboro tapped into her Taimanin Art, a special skill unique to those who have Taima Particles flowing through their very veins and bloodline. By technicality, this means that all Taimanin are half Human and half Demon as a result, as Demons from the Dark World have been shown to have large amounts of Taima Particles flowing throughout their body.

When tapped into, these Taima Particles allowed Taimanin to bring forth their hidden potential to turn the tide of battle in their favor.

Oboro's Taimanin Art, Seal of Hypnotism, allows her to enslave many to her will. To go further in depth, it allowed her to see a person's mind and she can influence them to do her bidding. It was through this ability that gave such a meteoric rise in the ranks of Nomad in the first place.

Oboro's eyes widened when she noticed that something was very much wrong with this man. Most humans are easily manipulated by her Taimanin Art due to the simplicity of the mental defenses they have erected in their heads.

This man's mental defenses, however, were something else entirely.

It was less like looking at a walled city and more like standing at the very front of a raging inferno. It was like Astaroth herself had decided to make this man her champion.

Where most mental defenses of men and women were centered around stability and positivity, this man's mental defenses were centered around hatred and insanity. And yet despite the insanity that swirled around him like a vortex, there was the undeniable sense of focus and cunning that this man has.

He was giving off the illusion of a mad beast when in reality he was a brutal and cunning predator that knew exactly how to hunt his prey.

This man was dangerous, too dangerous. She was unsure if Edwin Black, her superior, could sway this man over to her side.

He had to be eliminated.

A shame, she would have liked his company as her thrall.

She suddenly shifted direction and made a beeline straight for him. The man did not visibly react and instead rolled out of her charge, brandishing another weapon that made Oboro pause in a fear that she had hidden from sight.

After all, it was not every day that your opponent can just pull out a massive industrial purpose chainsaw out of thin air and hold it in one hand as if it were a wakizashi.

The lightning gun had long since disappeared and the man slowly approached her. He was taunting her, slowly swinging his saw while approaching her in a casual manner.

"Bastard! I'll have your head!" She brandished her claws and met him head on for melee combat.

Her claws met his chainsaw and sparks started flying. She sent out a knee to his gut, but the man did not budge.

God above, it was like hitting a brick wall! Oboro gritted through the pain and did what she could to redirect the chainsaw from mutilating her.

Using both feet, she kicked the man and propelled herself away from him. She dashed around him, becoming a blur that rapidly circled around the man.

She saw an opening and took it, shooting straight for the man's back. Her claws dug deep, piercing the armor with the blades coming out the other side.

Oboro smiled maliciously. Finally, that was one threat down.

Silence reigned on the streets. Even Asagi, who had broken free of her immobilization thanks to Kyousuke, was silent as her savior went still.

To their collective shock, the man suddenly moved again. With one arm, he reached behind him and threw her off!

Oboro's eyes went wide when she saw the damage to him. His wounds were healing at an unnatural rate.

She used Seal of Hypnotism again and began to read as much of this man's energy as she could.

She stilled when she saw the energy flowing through him. The energy that flowed through him was not natural. A normal person's energy signature often showed up as a bleach white like the vast clouds in the sky when they are at a calm state or close to it.

This man's energy signature was a crimson red like blood. She has not seen such a crimson signature since…

Edwin Black.

She growled lowly.

Oboro made to charge at him again with her arms wide and her claws extended. She intended to rip him up once more.

The man had other plans. He rolled out of the way once more and, once Oboro passed him, struck. The chainsaw's teeth ripped into Oboro's exposed backside. The Traitor Taimanin coughed up blood and hacked out pieces of her lungs. By the time most of the chainsaw's length pierced through the other side of her, she was barely hanging on.

Oboro, defiant to the end, spat whatever blood had pooled up in her mouth at the man.

The man did not react, the blood that splattered across his visor simply trailing down its surface. With one last breath, Oboro finally died. She died at the hands of one that will shake the very foundations of this world.


Well, that was an interesting fight, he mused to himself. As fun as that was to fight ninjas and whatnot, he still needed to find a way home.

The marine simply flicked the woman's corpse off his chainsaw.

In terms of challenge, it was like dealing with a fast Imp with the brute strength of a Hell Knight. Or perhaps a more appropriate comparison would be those Possessed Marines that he once called his brothers and sisters in arms.

He heard someone call out to him and he turned his head to see the two other humans that were in the house cautiously approaching him. To show that he meant no harm, he placed away his chainsaw and raised his hands in a non-threatening manner.

Or as non-threatening a UAC Space Marine covered in blood could be.

The woman, who he now noticed had deep blue hair, spoke to him. And her words confirmed his suspicions.

He was in Japan, on the other side of the world.

Well… fuck.

His Japanese was rather rusty, and he highly doubts this woman would be patient enough to point him in the UAC's direction.

"English," he spoke slowly and clearly, hoping that the woman would understand. The woman blinked twice before registering the marine's word and apparent nationality.

"Oh! Sumimasen," she bowed down in apology before speaking in an accented version of English. "I did not-o realize that-o you were a foreigner."

He audibly sighed in relief. At least he can get some answers, awkward as they may be.


[Tokyo Kingdom | Nomad HQ]

He felt the soul of Oboro's clone return to him. Usually when Oboro perishes, her soul returns to him completely whole. This time, however, it was different. Her soul came back to him in pieces, each one fragmented and driven mad by the pain.

This was not planned, not planned at all. She was supposed to bring Asagi to him, not get herself killed by some anonymous third party.

Edwin Black exhaled sharply when he grabbed the main shard of Oboro and saw what exactly killed her body in the first place. He could get a small read on what this man was, from his rage to his cunning brutality. It reminded Black of himself back in his ancient youth.

"Master," a woman's voice broke him out of his thoughts, making the Primordial Vampire turn his head to address the speaker. His ever-so reliable bodyguard and close confidant, Ingrid, looked at him with concern in her eyes. He smiled at her concern, making the Hell Knight blush.

Of all his recent companions, none have made an impact on him like Ingrid had. Her skills as a Hell Knight, her loyalty to him, her analytical mind, everything about her made Ingrid wonderful in Edwin's eyes.

But he cannot afford to compromise their current relationship.

"It is no concern, Ingrid. It appears that Oboro has been eliminated by an unknown." The Hell Knight's eyes widened at her master's words.

"Have we been compromised?"

"No, at least I don't think so," he coolly responded. "Her soul has returned to me, but she is fragmented. It will take months before she can be made whole again."

He narrowed his eyes as he finished speaking. This unknown variable, this anomaly, could potentially jeopardize everything he has built.

But perhaps this unknown could be swayed in his favor.

"Ingrid, have some of our assassins and investigators look into this new player." Edwin's bodyguard nodded and turned on her heel to carry them out.

"And be careful," he added, making the Hell Knight stop in her step. "While Oboro could not match you in physical strength, she was still a formidable fighter. Whoever took her out is dangerous, perhaps even for you." He did not mean that as an insult, but Ingrid sure as hell consider it as one.

"Understood, Master Black," she responded before heading out.

As she left, Edwin Black leaned back into his chair, deep in thought.

Who was this man and why did he single out Oboro? Where did he come from? And what were those weapons he carried?

They seem a little too advanced, even for the United Federation of American-Pacific States to create.

"I will figure out who you are and, if you are too dangerous, eliminate you from the board entirely," he lowly spoke, his voice taking an inhuman tone.


[United Federation of American-Pacific States | Defense Science Office, Mexico Complex #07]

She inhaled sharply as a crushing sensation clawed at her from within. It was like her very soul was being torn asunder and crushed under a heavy iron fist. She clutched her heart as best as she could, but the sensation would not stop. It was like a roaring inferno was eating her alive!

"MA'AM?!" Koukawa Asuka, bless her kind heart, reached out and stabilized her as best as she could.

"Shit," one of the guards stationed in the room rushed out. "We need a medic, STAT!"

She screamed out as the sensation intensified. Her mind could not bear the strain of the sensation, and Koukawa Oboro fainted.

"What the hell was that?" Asuka asked as paramedics loaded Oboro onto a stretcher to be sent to the sickbay.

"I don't know," one of the researchers responded. "But whatever it was, it must've been really serious if it made the Director faint on the spot like that."

Asuka frowned at man's response. Whatever could have sent such a powerful attack to Oboro must be very dangerous indeed. She was no fool. There was no way that was a natural reaction from Oboro's body.

"I want answers ASAP! We need to know more about this phenomenon."

"Yes ma'am!" the researchers nodded and got to work with more energy than before.

"Jones," she called out one of them. "Have Simmons-chan look into the Director's condition, will you?"

"Are you sure? Miss Simmons is more at home with robotics and prosthetics, Miss Koukawa."

"I know, but I've read her file. She also has machines that can hopefully answer some questions regarding the Director's sudden episode."

Jones nodded and made the call to one Emily Simmons. All the while, Asuka was in deep thought.

"What exactly could have done this to you, Kaa-san?" she wondered and thought of many scenarios, but none were truly concrete.

One way or another, she will find out who was responsible of this strike.

Time was running short, and she cannot afford letting that bastard Black get away with everything that he has done to the world.


A/N: Sorry if the ending was lackluster, I was running on fumes when I wrote the epilogue.

So, I got vaccinated with the Jansen brand of vaccines and right now I feel like I'm having a fever. Increased body temperature, numbing sensation around the area where I got vaccinated, and overall drowsiness. That and the notable burning sensation when I have to go use the John.

It's not as bad as it sounds.

Nothing life-threatening, and hopefully this will all come to pass and I can be a bit more active again.

Anyway, next on the agenda regarding Doom Mod Oneshots is not gonna come any time soon but I do have an idea in mind.

La Tailor Girl crossed over with Miraculous: Tales of Ladybug & Cat Noir. Yeah, completely random but that's the fun part about writing multiverse anthologies such as this: I can go completely crazy, and nothing would seem out of place.

Some other ideas I have involve a crossover between Hell-Forged and Dark Souls, a crossover between The Space Pirate and Metroid, a crossover between Animal Crossing and a blend of Doom canon and a few Doom mods, and probably a continuation of the Ashes: 2063 and The Last of Us: Part 2 oneshot down the line.

Until then, see you folks next time!

[EDIT 08-15-2021 A.D.] Fixed a few errors in spelling and/or wording.