Rooftop Of DEM's Building:

Westcott's demonic eyes glared at his former pawn that is glaring at him back. He summoned another spear again and hurled it towards her with all of his might, however the girl swiftly evaded the spear again by flying to the sky.

"You cowardly traitor! I gave you power and strength Artemisia and this is how you repay me?!" Westcott roared out. He summoned multiple succubus and ordered them to restrain the former Adeptus.

When the succubus was about to attack her, Artemisia readied her great sword and the she-demons got cut into pieces like chunks of meat. This further angered the demon king, he summoned multiple spears on the air and he commanded the spears to strike down the girl. The spears went flying towards Artemisia like a missile. The former Adeptus used all her enhanced strength to flap her bony wings to boost her speed to outrun or outfly the spears that's hunting her by the air.

"I wouldn't be able to tank all of his attacks right now! If all these spears hit me, I'm done for it!" A drip of sweat formed on Artemisia's forehead.

She evaded some of the spears, but to her luck -- one spear are really sticking to her like a magnet.

"Damn it! I'm too heavy!" Artemisia cries out as the spear is closing in to her and stabbed her left wing making her yelped. She immediately lost her balance and started to fall to the concrete floor uncontrollably. She tried her best to harden her armor, however the hardening fail and the impact when she collided on the concrete floor still damaged her and left her paralyzed from the pain.

Westcott smiled, showing his fangs as he got another victim added to his collection. He summoned his purple aura, but before he could do anything to Artemisia, he got pummeled on the rooftop's floor by a red and blue flash of light.

"Miss us?!" Dante smiled at him sinisterly.

"DAMN YOU ALL TO HELL!!!" Westcott charged his body with pure demonic energy and both brothers got sent flying to the air.

The sons of Sparda quickly recovered and transformed into their demonic form by exploding their own demonic powers through the sky. Red and blue light illuminated the sky like two bright suns as the abyss suddenly disappeared in a short moment. The roars of the sons of Sparda echoed and shook the entire city of Tengu and the lesser demons halted their approach towards the building and starts cowering like a tiny dog. The force from the transformation planted Westcott even more on the rooftop floor and making him unable to move any muscles.

"This is impossible!" Westcott with widened eyes mumbled.

He gritted his sharp teeth and roared out loudly. "IMPOSSIBLE!!!"

Westcott with all of his strength, forced himself to fight through the shockwave from the brothers' power. He flew towards them with multiple spears flying besides him. He launched the spears towards the brothers, however it fail to hit them as they easily evaded the spears while flying towards him.

Once the brothers are getting closer to him with their weapons ready to slice him, Westcott summoned a dual spear and use it as a shield to block the Yamato and the devil sword of Dante. The demon king grunted and his arms are shaking as he is fighting and trying to not let himself break under the sheer force and brute strength of the sons of Sparda.

When he was just about to get overwhelmed, Westcott engulfed himself with demonic power making the brothers to quickly fall back. The brothers stared at the sight of the demon king releasing an almighty roar and demonic energy. The brothers knew Westcott is buffing his destructive power but they couldn't do nothing but to stand back, because charging blindly will let the purple aura suck out their demonic powers greatly and it will further strengthen the demon king.

"Now it's my turn." Westcott muttered.

He flapped his wings leaving a stormy gust of wind that can razed multiple house. With his super speed, he disappeared out of sight like he teleported. Dante and Vergil did the same, they too disappeared out of plain sight and the brothers and Westcott fought with speed faster than sound and light.

As they going all out with each other, Artemisia could only watch in awe. She can only hear blades and spears colliding with each other and she can only see the sparks of metals clashing and blue, red, and dark purple lightning.

Inside DEM's Building:

*RUMBLE!!! RUMBLE!!!*

"W-What's happening?!" Yoshino cries out as she is stumbled on the ground because of all the shaking.

"Looks like someone is fighting, did the brothers already escaped?" Shido wondered while holding on to the rails.

The entire building shook like there's a powerful earthquake or a spatial quake. Shido and the girls trying to maintain their balance while they ascend up the stairs and assisting each other so no one can fall down.

"Kurumi, can you make a portal all the way to the rooftop?" Kotori asked.

Kurumi stops and tried to use her powers.

Sighing in annoyance, she replied. "I'm afraid not, fighting those creatures really took a toll on me."

"How about you Mukuro?" Kotori asked the blonde spirit.

"No, Mukuro cannot do it." Mukuro replied.

As they keep going they heard multiple cries and roars coming from outside the building. When they peek outside from the stairway window, they saw the massive swarm of demons begin their advance again towards the building. Shido and the girls all stared at the massive hoards with shaking eyes and cold feet.

"Are you guys ready to fight?" Shido trembled.

"We don't have any choice now but to fight." Kaguya stated.

The white haired girl steps in.

"But we can't fight them here. Come, follow me I just have the right place to fight them." Origami said as she run up the stairs with the others following behind.

Once they've reached the 20th floor, Origami bursted through the door and they run through the hallway passing room by room until they reached a double door. Once Origami opened the two doors, all of them went inside and locked. The room was very spacious similar to those call center production floor. Shido with the help of the girls l, they stacked all of the office desk on the door to give them some time to prepare for the biggest battle they are going to experience.

"Hurry! We don't have much time!" Miku who is looking out the building window cries out.

Outside the building, the demons already charge their way inside the building. Searching room by room and breaking doors in each floor they ended up in. Shido and the girls hear their howl and blood curdling shriek inside the building making them trembled. The girls summoned their angel and their clothes transformed into their spirit armor, preparing to hold their ground against the horde.

Suddenly...

*BANG!!! BANG!!!*

The door and the stacked desks are starting to move as the demons trying to break in. To their surprise, the lock immediately give away and all of the desks flew towards Shido and the girls. Tohka immediately took action by summoning a purple barrier around them to block all the incoming projectile. The demons successfully breaks in and roared out at their prey who is trap like rat.

Origami suddenly flew out of the barrier and all of her cannons took a circular formation in front of her and the barrier focused towards the charging hoard.

"Metatron! Artelif!"

The cannons charged light particles around the circle. After charging, the cannon released a destructive beam of light that turned the line of demons into ashes and leaving the hallway destroyed. The beam traveled on the other side of the building, burning a large hole through the concrete wall.

"Nice job Origami!" Shido praised.

They did stop the first wave, however the second wave is much bigger and more aggressive. Onis didn't come alone, behind them are samurais with their general. They all stampede and stomped their way inside the room, not caring wether they kill each other just to get their prey on their claws.

Rooftop of DEM's Building:

Dante and Vergil stand tall while Westcott is all battered and gasping for air. Westcott bleeding with black ooze coming from his wounds and his leathery wings have holes and slashes in it.

"Well, that was emabarrasing." Dante chuckled.
"What's wrong? Can't keep up?" He taunted.

"Even though you had absorbed Mundus and Pluto's powers and even if you weaken us and absorbed portion of our powers, you are still no match for the sons of Sparda." Vergil stated as he glared at the eyes of the demon king.

Westcott clenched his fist on his spear very tightly. As he was thinking of doing another assault, he choose to spread his wings and flew away to the dark sky.

"We got ourselves a runner! We're in for some crazy goose chase!" Dante chuckled.

"What a coward." Vergil growled.

Both him and Vergil immediately transformed into their demon form and both of them shot straight through the sky like a rocket, not letting Westcott get away to recover.