In DxD Starting with Sign-Ing in as the Red Dragon

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[Name: Katarea Leviathan (Female)]

[Level: Lv201+48 (Initial Maou Level. After using Ophis's Snake, her level reaches the peak of Maou level, Lv249)]

[Attribute Evaluation]

[Note: Strength within the same level.]

[Strength: E]

[Speed: D]

[Magic: C]

[Physical Durability: E+]

[Martial Arts/Spell Proficiency: C (The ancestral spells of the first Leviathan Maou. Although not perfectly compatible with every descendant, they are still highly effective for Leviathan heirs.)]

[Sacred Gear/Bloodline Ability: B- (A pure-blooded Leviathan descendant, though she has yet to awaken the magical trait "Tail of the Sea Serpent Dragon.")]

[Comprehensive Evaluation: D+ Level Maou.]

[Overall Assessment: A mediocre talent who relied on her Maou bloodline to reach the Maou level. To achieve this, she even resorted to using rare treasures that drained her potential. Without a special opportunity, she will likely never break through to the Intermediate Maou level.]

After casually casting an appraisal spell on Katarea and confirming that she hadn't surpassed the Maou level, Akira turned to the underworld princess beside him.

"Seekvaira, let's take her on together!"

"Alright! Let's do it, Akira!" Seekvaira smiled, spreading her radiant wings.

[Vanishing Dragon Balance Breaker!]

[Balance Breaker—'Armor of the White Dragon Emperor'! (Dividing Dragon Scale Mail)!]

White and blue light flickered as Seekvaira instantly donned the White Dragon Emperor's armor! The white armor, adorned with blue gemstones, wrapped around Seekvaira's curvaceous figure, exuding a unique allure.

"Such immense magical power! It's almost on par with Vali!" Katarea was shocked. How could there be two White Dragon Emperors?! Vali was a half-human, half-devil hybrid, but Seekvaira was a pure-blooded devil!

"Tch! So what if you team up? I'm a descendant of Leviathan, a bearer of the pure Leviathan bloodline!" Katarea sneered, raising her staff.

[Serpent That Devours the World!]

Barren land was quickly flooded as water surged and gathered, covering the entire battlefield in an instant! Dozens of water serpents emerged from the ocean, charging toward Akira and Seekvaira simultaneously!

[Divide! Divide! Divide! Divide! Divide!!!~~]

Seekvaira spread her wings, hovering in the air. All the water serpents that approached her shrank dozens of times in size! By the time they reached her, they were no larger than caterpillars.

The tiny streams of water couldn't even scratch the White Dragon Emperor's armor, merely splashing harmlessly against it as if giving Seekvaira's armor a quick rinse.

The true White Dragon Emperor, Vali, might only be at the initial Maou level in terms of base strength. Seekvaira, while slightly weaker than Vali, wasn't far behind! In her current state, Seekvaira could be considered a mini-Vali!

The battle quickly escalated into a fierce clash.

Seekvaira took the lead as the vanguard, while Akira provided support. Relying on the White Dragon Emperor armor's formidable defense and halving ability, Seekvaira charged recklessly through Katarea's forbidden-level spells.

With her overwhelming offense, Seekvaira kept Katarea so busy that she couldn't even spare a moment to attack Akira as a diversion.

Meanwhile, Akira leisurely began charging his attack.

[Boost! Boost! Boost! Boost! Boost!!!!~~]

[Extreme Flame!]

A "Sacred Flame" amplified to its limit was hurled by Akira, evaporating a large number of water serpents in its path.

"Hmph! Even after charging to the limit, it's barely at the Maou level!" Katarea snorted, raising her staff. Her current strength was at the peak of the Maou level, almost reaching the Super Maou level. Why would she fear such a small fireball?!

Katarea blocked Seekvaira's attacks with one hand while charging a spell with the other. A magic circle rapidly formed, filling with magical energy.

Just as the spell was about to activate, Akira silently revoked Katarea's access to Ophis's "Snake."

Like a deflated balloon, Katarea's power rapidly dwindled!

"What?! My power! What's happening?!" Katarea panicked.

What was going on? Why had Ophis's Snake stopped working?!

Katarea's magic weakened drastically, becoming more than ten times weaker than before!

Seizing the opportunity, Akira's Sacred Flame and Seekvaira's attack struck Katarea simultaneously!

Seekvaira passed through Katarea, leaving a long gash across her waist. Immediately after, the Sacred Flame engulfed Katarea.

"Boom!~"

The Sacred Flame completely enveloped Katarea, relentlessly eroding her body and soul.

Akira's Sacred Flame originated from Agumon. According to the system's description, Agumon's sacred power was among the highest in this world, even surpassing the Four Great Seraphs!

Such a high level of sacred power caused Katarea, a devil, unimaginable pain!

"Aaaaaahhh!!~"

Katarea let out the most agonized scream of her life, the shockwaves even dispersing the clouds in the sky!

Watching Katarea's suffering, Akira raised an eyebrow.

It seemed he had underestimated Agumon's sacred power. After evolving, Agumon's sacred power had grown even stronger.

A few seconds later, Katarea's charred body fell from the sky.

Just before she hit the ground, Akira swooped in and caught her.

Looking at Katarea in his arms, Akira felt a surge of excitement.

Finally.

He could finally obtain a Maou-level subordinate!

"Click~"

With a soft sound, Akira fastened a pet collar around Katarea's neck. The collar appeared briefly before vanishing under Akira's control.

"Done!" Akira gave Seekvaira a thumbs-up.

He didn't immediately reincarnate Katarea as his subordinate. Now that she was collared, he could do so whenever he wanted!

"Yes! Akira! We won!" Seekvaira excitedly threw herself into Akira's arms, planting a kiss on him.

Just as the two began to get intimate, a sudden change occurred.

"Hum~"

A teleportation circle appeared in the air. A mature, silver-haired beauty stepped out, calmly observing the entangled Akira and Seekvaira.

The newcomer... was none other than Grayfia!

Note: So far this story is published up to chapter 70 on my patreon go take a look and remember if you reach 130 stones of power I will publish the next chapter.