Disclaimer: First Chapter
Story Start!

Stress.

Berserker ran down the streets of Kuoh in her high heels as she went on her journey to destroy the source of her Master's stress. He had an extremely stressful first day at a new school, where the students already new of the rumors about him, and a gang followed him and challenged him, proving him to be a delinquent. The amount of rumors that were going to spread about him meant that it was only a matter of time before he was expelled, and he had gone to be worrying about that.

It was her job to destroy his stress.

Destruction was what she was good at.

"Uuuu." Berserker groaned as she swung her war hammer and smashed through the gates of the school when she ran up to it, and she didn't stop running as she continued her path towards the school itself.

Simple solution.

Destroy the school before her Master was expelled from it, and that would negate the rumors being further spread. He couldn't be expelled from a school that didn't exist, and thus he could lose the stress he was feeling over it. She thought about this as she ran at the school, and she slammed her weapon against the front doors of the school and completely shattered both of the doors to the school and all he glass windows that had been around the doors.

"RAH!"

-In the Other Building-

"... Did anyone else hear that?" Rias asked when a loud banging sound echoed through the area, sounding like it came from the new school building. She blinked and looked at her peerage, those that were currently with her at least. Koneko had finished her list of jobs, and was getting a snack before going home to rest for school. Akeno was serving tea like she always did for Koneko when she finished a bunch of requests.

Koneko looked towards the wall, where she could tell the direction of the bang came from.

"I didn't hear anything." Akeno had been humming to herself, not paying too much attention to her surroundings to really notice any bang noises.

A Magical Circle formed in the middle of the room, red in color, and a handsome young man came out of it slowly. Her Knight, Yuuto Kiba, with his sword at his waist already.

"That was quite fun, the client wanted to test his skills with a sword, and for a human he wasn't bad. I completed the pact, and got the payment already." Yuuto spoke as he placed a stack of rare magazines on the table. The payment for a pact with a devil could be anything, so long as it was decided before the job was completed. For sparring, some rare magazines was more than a fair enough trade.

*BOOM/CRASH*

"What was that?" Yuuto asked when he heard a very loud bang, and what sounded like part of a building collapsing. "Are we under attack?" Yuuto drew his sword and got himself mentally prepared for an attack.

"Koneko?" Rias asked.

Koneko sniffed the air.

"No Fallen Angels, Rogue Devils, or Angels in the area... there is something at the school building though with a decent amount of magical power." Koneko gave the situation to them. She stood up and popped her knuckles, knowing that they were going to go next door and take care of the problem attacking the school. During the day, the school was run by the devils of Sona Sitri's peerage, but at night was when they of the Gremory peerage were in charge of protecting the city and the school.

Rias stood up from her desk and fixed her skirt.

"If it doesn't have too much magical power, then we should take care of it before it grows stronger." Rias was pretty nonchallant, considering that the school was under attack. Koneko already judged the thing as not strong enough to warant a sense of danger. She would keep her guard up, but she would allow her peerage to take care of the problem while she watched over them.

"This will be fun." Akeno licked her lips.

Who would be dumb enough to attack a school in well known devil territory?

-With Berserker-

With a swing of her weapon, swinging at full attack length, she destroyed all of the desks in the school room and shattered them against the walls. She broke down two of the walls, and started to run out of the room as the ceiling started to collapse on the room as she left it.

She smashed a hole in the floor, she was on the 2nd floor, and jumped into it to go back down to the previous floor.

She needed to get rid of her Master's stress.

She needed to be worthy of being-

Berserker was kicked with Koneko smashed the heel of her shoe into her ripcage, before her feet could touch the ground she was knocked through a wall, and then slammed through the brick wall to the point that she was outside of the school. She landed on her back, looking up at the sky in confusion for a moment. Her wedding dress ripped at the ribs to show an indent in the shape of Koneko's foot, where her ripcage was shattered.

It hurt a lot.

Berserker stood up and shook her head as her rips snapped back into place, her Master's potent life force flowing into her through their weak connection. She pulled more of his energy from him to speed up the healing of her body.

"Advanced Regeneration, so she can heal from damage? That's good to know."

Berserker felt lightning strike her from above with enough force to fry a regular human in an instant. She just held on tightly to her weapon, and it started to absorb the electricity that was being used against her. Her horn started to absorb it as well, and she grunted when the attack was finished. Her magical powers enhanced even further by absorbing an element that she was naturally attuned, and mostly immune, to.

Enemies, they attacked her.

"Uuuu." Berserker grunted as she daintily ran towards the two visible enemies in front of her, prepared to end their lives with no hesitation in even a single one of her steps. She side stepped when an attack came from her left side, and a shallow cut appeared on her back, a young man appeared several meters away from her with her blood on his sword. She stopped moving when she saw that she was surrounded by 4 figures instead of the 2 in front of her.

"State your name and what business you have at Kuoh." Rias stepped forward and demanded of her.

Berserker just started to run towards the fast boy.

"Doesn't seem like she wants to talk." Yuuto dodged a swing that sunk into the ground, and cratered the stone. Berserker didn't stop moving as she chased after him, and kept swinging at him to land even a single hit. He nimbly dodged her, and he made sure that none of her deadly attacked hit him.

She wasn't slow.

Each of her attacks was very precise, but extremely predictable for him. She wasn't slow, but she didn't have enough speed to catch him off guard with her attacks either. Her reaction times were actually decent as well, because when he swung his sword she blocked with her weapon's handle and counter attacked with skill.

Akeno charged up a fireball, since her favorite element was useless right now, and threw it towards the enemy with the full expectations that Yuuto would dodge. He created a distance between himself and Berserker, and she turned to face the fireball. Spinning her weapon, she smashed the ground and created a barrier wall of stone between herself and the fireball.

*BOOM*

"RAH!" Berserker came running out of the explosion of dirt and flames unharmed, with a new target in mind.

Koneko punched the warhammer with her fist when Berserker swung it at Akeno, and pushed back Berserker.

"She fights like a complete berserker." Akeno noted when Koneko had to keep punching the warhammer as Berserker kept swinging at her. Akeno herself forgotten for the moment now that a new threat appeared in front of her line of sight. She started to charge up her magical power, since lightning was out of the question, and fire was out with Koneko standing this close, she would focus on her other elements of ice and water. "It's not fun when an enemy doesn't feel any pain." Akeno was disappointed when she saw the wound that Yuuto inflicted earlier was already healed.

She showed no signs of slowing from that wound.

'I'm stronger than her, but her attacks are relentless, and she isn't growing tired or getting out of breath.' Koneko thought as she continued her assault of punches, and she was walking forward to try and force Berserker backwards away from Akeno. Her attacks packed more power, but the longer she was fighting against this monster the more she could feel her enemies strength was growing, bit by bit.

The enemy was slowly starting to get stronger.

Magical energy that Akeno was releasing into the air was getting sucked up into her warhammer, and was being channeled into her body. She was healing faster as well, because when Yuuto cut into her arm again and it fell to her side limply she used her one arm to swing her hammer at him as her arm began to heal.

"Take it." Koneko punched Berserker in the face and sent her flying into the school's brick wall, while she was distracted by Yuuto. "She's absorbing magical energy to increase her abilities, so try to avoid releasing magic into the air. The only element she can directly absorb seems to be lightning." Koneko informed everyone else of what she learned from her fist to hammer engagement.

'I could feel metal inside her arm.' Yuuto looked at his sword, and while it had blood on it, he was sure that he had felt something metalic inside of the enemy.

That was strange.

Berserker was already running towards them again, and her arm healed as she grabbed ahold of her weapon with two hands again. She stopped 20 meters in front of them though and raised her weapon up to the sky. The sphere on top of it closed yellow as it opened up a little, and she smashed it into the ground. She created a large crater between them, and lightning shot up from the ground and into he sky.

Yuuto and Koneko were both struck by weak lightning that rained down on them from the sky, putting craters in the ground underneath them as they were sent flying. Yuuto hit the school building and dropped his sword, bleeding from his arm and leg, the rest of his body slightly damaged but still able to stand. Koneko had taken the worst of it though, since the lightning bolt that struck her had been stronger than the one that struck Yuuto. Her clothes were in tatters, and she had several visible wounds on her.

"Rah!" Berserker's hammer closed itself, and she started to run towards her weakened enemies with lower speed than before.

"Can you two still fight?" Rias had narrowed eyes as she stepped up, prepared to end the fight herself. Yuuto responded by quickly picking up his sword, and running at a greatly reduced speed towards Berserker. Koneko's response was much the same as she chased after Yuuto, at her usual speed but her arms were damaged. "... Good, I can continue to trust you with this. Let me know when you want me to take over." Rias was angry, but if her peerage was willing to keep fighting without her, then she would watch the enemy and figure out what weakeneses it has.

A large wave of water flooded the school grounds as Akeno unleashed her magical attack, once she finished charging up, and washed Berserker backwards while Yuuto and Koneko both activated their wings and flew above the water.

"We've got this." Akeno created floating icicle spears in the air and pointed at Berserker, sending them flying towards her as Yuuto and Koneko got within striking range. Yuuto slashed her right leg as she stood up in he water, forcing her to take a knee. Koneko kicked her in the neck, forcing her onto her back on the ground, and the ice spears stabbed into her shoulders and her thighs, pinning her to the ground.

The water dispersed over the school grounds, allowing them all to stand normally quickly.

Berserker started to stand up.

More ice spears pierced her arm and stuck her more firmly to the ground, freezing her in her place for a moment.

"Aaaah!" Berserker gave a scream, not of pain, but of anger as she glared towards Akeno, the source of her inable to move.

Her body started to generate large amounts of electricity as her hammer opened up again.

...

Berserker stopped though.

"Uuu."

Right, at the moment the bond between her and her Master was weak, so he wasn't feeling much of the pain from the damage that she was taking. If she used that suicide attack though, then even across their weak bond there would be no way that he wouldn't feel the amount of pain that she was going to be in.

"She stopped?" Rias asked with a raised eyebrow.

Berserker forced herself to stand as the ice spears slid out of her body, and she looked towards them for a moment. She grit her teeth and grunted at them a few times, before she picked up her weapon up.

"This thing's a monster." Yuuto stated as he realized the enemy might be more dangerous than she was letting on.

She was somewhat fast, extremely physically strong, and she could enhance her physical abilities by absorbing magic from the air. She seemed to feel no pain, and didn't fear getting attacked in the slightest. She could attack at long range, and right now his speed was cut down to less tha half of what it was before. In direct combat, in their weakened states, both he and Koneko would lose to this opponent on their own. She guarded against any blow that would be fatal, and didn't bother blocking attacks that wouldn't be.

She was a predictable, unpredictable, berserker fighter.

She was a contradiction of a warrior.

"No lie there." Koneko raised her fists up.

This was going to be a long fight it would seem, and the enemy didn't look like she was even starting to run out of stamina. The only one undamaged at all was Akeno, not counting Rias who was just watching.

'No... she feels pain, when she gets hit she slows down for a brief moment.' Rias didn't know what the deal was with this woman.

"AAAAAH!"

Berserker started to run at them, ready to fight even more.

Her body vanished as she was running, disappearing into particles like she had never even been there to start with.

...

"Where did she go?"

"Lets get to repairing the school before morning."

-With Naruto-

"Fucking bladder... middle of the night bullshit." Naruto groaned as he walked towards the apartment bathroom. His body was a little sore, maybe he was sleeping in a bad position or something? He didn't know, but it would go away soon enough, Naruto yawned since despite his soreness, he did feel a bit better.

Like some of his stress was relieved.

Chapter End!
Please Leave Me Lots of Nice Long Reviews, But No Flames Please!

I'm going to point this out to the people that say Rias' peerage were being beaten.
1. Berserker was losing that fight, while it would have been a very long fight, Rias' peerage in the end had an overwhelming advantage of teamwork on their side and they would have taken her down in the end.
Berserker got 1 attack in on Yuuto and Koneko that hurt them badly, simply because they were completely unaware of how her attack worked and had no time to react to it.

2. The second either anyone in her peerage would have been extremely hurt, Rias would have stepped in and they would have completely overwhelmed Berserker.
Also, it does not help that Berserker can't use her full power because Naruto didn't actually summon her on purpose, and they don't have a strong bond yet.
(Note: The stronger Naruto's bond is with his Servants, the more power they can use since the magical connection between them is stronger)