Kumiko 3rd POV
She glanced at the battle ahead and sighed, the devils couldn't win against them.
"Looks like the Blackstone decided to go all out, just like I predicted…" she stated before lifting her hand and pointing at the devil army "Winged Hussars, attack by the two flanks! Germans, charge straight forward!" the rest of the phantom soldiers obeyed her command before that she manifested a black katana and planted it on the floor before moving out to fight.
"There she is!" yelled a fat man, a noble without doubt "The one who captures her will get a night with her!"
"Huh?" now… she was pissed.
She summoned a Nodachi and either decapitated them, or pierced their hearts. She had lost count of her victims after 20, she knew better than to compete with the Blackstone.
"How?!" asked the noble with fear as his personal soldiers were slaughtered by a woman.
"You have something you wish to confess?" asked Kumiko before that a blue demonic mask with blue flames appeared on her face "Because the guardian hungers"
The noble tried to go away, but a hand came out of the portal and caught the noble, dragging him through the gate.
"So you are the last Oni" said a tall man whose head is completely bald and has a goatee on his chin "Too bad that you decided to become our enemy by attacking us"
"Better that than being raped every night" she replied with venom in her voice "You're the ones who asked for this war. You're the ones who attacked me first. And now, you will face the consequences of your actions"
She rushed to cut him, but the blade bounced off. He smirked as he said "Don't be foolish, little girl, only one person can hurt me, and you aren't that person"
"Let's see about that…" mumbled Kumiko as her blade started to glow with an orange color "Have you heard of the most deadly skill a Kensei can learn?" he raised an eyebrow at that before seeing her in front of him, ready to strike him to his stomach "It's called the Unlockable Feat" he felt the blade cut into him "And it can ignore any kind of defense"
"T-That's impossible" he stumbled back as the Oni girl removed the blade slowly from his stomach.
"Pathetic, your claim over me is nothing, your power can't adapt itself, your power is nothing but an illusion, and the worst thing is that you keep clinging onto those lies" said Kumiko before evading a blast of crimson energy.
"Are you alright, Falbium?" asked a male version of Rias.
"Don't worry, Sirzechs" replied Falbium as he held his wound "We need to fall back now"
"What are you talking about?" asked Sirzechs before looking around as his eyes widened "Impossible… the German soldiers and the Winged Hussars…?" he then saw his men getting killed.
"Order the retreat" said Falbium "We will lose if it's continue"
"You can't retreat" stated Kumiko "You are in a corner"
Sirzechs was about to say something when a soldier arrived beside him. "The Maou Serafall is injured and the Maou Ajuka is unconscious!"
"So, do you agree on leaving me alone? FOREVER?" she asked as she readied her nodachi.
"Are you going to call back the spirits from the city?" asked Sirzechs.
"Can be done easily" replied Kumiko, still with her guard up.
"And the phantom soldiers?"
"I will call them back"
Sirzechs sighed before yelling "To all the forces, fall back! We've lost…"
"Smart choice" said Kumiko as her soldiers fell in a defensive position.
From now on, the Underworld will remember the fear of what an Oni can do when pushed to the limit.
POV-DEVEN
The hulking black knight stomped back over to the portal. Now that he was in his balance breaker, he could look at it. The souls could not possess him even in hoards. He looked to see the red haird devil king himself and an injured Falbium. He was about to attack when-
"Hey blackstone, its over."
"Aww, I has having fun too." he responded in a sad tone
"*sigh*"
They returned to the base and were greeted by Vali, who rushed to Kumiko's side. "Are you ok?"
"Yes, im fine"
"You know Vali, you-OOF!" He was about to tease the couple when he was tackled by a white blur.
Kumiko and Vali walked away.
"Nya~ baka-senpai"
"What did I do now!?"
"Nya~ you left us without saying anything"
"Sorry, I was excited about attacking those devil bastards"
He was then dragged to their room.
TIME SKIP
Deven woke up early the next morning. He suddenly became hungry, it was starting to happen a lot. Apollyon said that it was his connection to the Hydra.
He discovered that he could call upon the strength and powers of the Hydra but when he did he developed the features as well.
His teeth will sharpen, his eyes will change to a burning yellow, his ears will grow points, his skin would harden into scales, and he would grow a long tail.
He decided to keep this hidden for now.
He trudged to the kitchen and saw something that woke him up instantly.
He saw Kumiko had fallen asleep at the table while drinking her morning tea.
He grew an evil smirk. 'Revenge' He thought to himself while summoning a marker with permanent ink, and a bag of super-hot spices.