Reincarnated in the World of High School DxD

The afternoon sun streamed through the windows as Kazuki finally stirred awake, his body still humming with the afterglow of last night's exhausting but exhilarating escapades.

A hot shower washed away the lingering evidence of his seven-way marathon—his first time handling that many girls at once, and frankly, his lower back was paying for it.

But after two weeks apart from the girls who'd been away on missions, there was no way he could refuse when they'd all begged for his attention.

By the time he'd knocked each of them out, in the best way possible, dawn had nearly broken. 'Thanks to that, I completely overslept.'

Now, Kazuki's stomach growled angrily.

Time to scavenge for food…

"G-Good morning…!"

The moment he stepped into the dining hall, his personal maid, Musel, spotted him—her face instantly flushing crimson as she bowed deeply.

'…Did she see something again?'

"Morning—well, more like afternoon. Where is everyone?"

"Ah, yes! Rias-sama and the other young ladies are currently selecting their outfits for tonight's party. Issei-sama is training in the garden."

Her cheeks still pink, Musel answered dutifully before hesitating.

"By the way… could I get something light to eat? I'm starving."

"O-Of course! Just a moment!"

She hurried off, returning shortly with a plate of sandwiches.

"My apologies. All the chefs are busy preparing for the party, so this is all I could manage…"

"You made these? They're perfect. Thanks."

He took a bite—'delicious.'

"Damn, Musel. These are great."

Her smile softened, pleased by the praise.

Musel had been assigned as Kazuki's personal maid during his stay at the Gremory estate.

A stunning beauty with light brown hair tied in twin tails, she was still rough around the edges as a maid—but her kind heart and gentle demeanor had earned her Grayfia's trust.

Like many of the maids here, she was a reincarnated devil, one of Grayfia's Pawn soldiers.

'And apparently, some of the maids in this mansion are Grayfia's own peerage members…'

Ever since she'd walked in on him and Rias naked on his first day, Musel had accidentally witnessed many… compromising situations.

She'd also quietly cleaned up after his messier escapades without complaint.

'I should repay her somehow before we head back to Kuoh…'

"Ah! Kazuki-senpai!"

After eating, Kazuki found Issei pumping iron in the garden.

'Damn, he's really bulked up.'

His Boosted Gear's performance would undoubtedly skyrocket with this newfound strength. Though he hadn't achieved Balance Breaker yet, his training had clearly paid off.

'Guess Azazel knows what he's doing.'

"Issei. Feel like a quick spar?"

"Huh!?"

"Show me how much stronger you've gotten."

"Y-Yes, sir!!"

Issei's eyes blazed with excitement—clearly eager to test his limits.

"Same rules as always. First clean hit wins."

"Got it! [Boosted Gear]!!"

The red gauntlet materialized on Issei's left arm.

『Boost!』

Every ten seconds, his power doubled. Kazuki channeled demon energy through his body, reinforcing his physique. Normally, 30% enhancement would've been enough to handle Issei—but now?

'Let's see…'

『Boost!』

A minute passed. Issei vanished from sight.

'Right? No—left!?'

Kazuki stepped back—just as Issei's fist blitzed past where his head had been.

'Speed and defense—pass. Now, power!'

Kazuki deliberately took the next punch straight to the gut.

"Guh—!?"

Even with [Floating Step] softening the blow, the force knocked the wind out of him.

'Holy shit. No wonder they call him a power monster.'

"S-Senpai!?"

"Tch… damn, nice punch. You win, Issei."

For a moment, Issei just stared—before suddenly scowling.

"B-But! You weren't even serious!!"

"I said it was light sparring. Besides, the rule was 'first hit wins'—and you landed yours." Kazuki smirked, clapping him on the shoulder.

"I used the same reinforcement as before and still got rocked. That's proof enough—you've gotten strong, Issei."

"Kazuki-senpai…"

"Have confidence, Hyoudou Issei! You've gotten stronger."

"…YES, SIR!!"

Issei's expression hardened with newfound confidence.

'Good. He was down about not reaching Balance Breaker, but this should help.'

With this, the upcoming Rating Game against Sona's peerage was looking promising.

As evening fell, Issei and Kazuki waited in the lounge while the others prepared for the party. Both wore Kuoh Academy's summer uniforms, their left arms adorned with the Gremory crest armbands.

While they chatted, Saji entered the room. Apparently, he had come as Sona Sitri's escort alongside Tsubaki, but after greeting Rias, he'd wandered over to join them.

The rest of the peerage had already headed straight to the venue.

Kazuki noticed it immediately—Saji's aura was thicker than before. "Looks like you've gotten stronger too," he mused.

"This'll make the next Rating Game even more interesting."

The three of them talked about their dreams.

Saji wanted to become a teacher—specifically, an instructor at the Rating Game academy Sona dreamed of establishing. When Kazuki and Issei praised his ambition, the usually brash guy actually blushed.

Kazuki's own dream was to rise as a High-Class Devil and establish the "Fuwa Clan"—a new noble house. With no family left except his grandfather, he wanted to build a legacy of his own.

Then came Issei's turn.

"I wanna be the Harem King!"

For a moment, there was silence.

Then—

"Pfft—HAHAHA! Yeah, that's so you!"

Both Kazuki and Saji burst out laughing, making Issei flustered before eventually joining in.

Just then, the door swung open.

"Sorry to keep you waiting, Kazuki, Issei!"

Rias stood at the forefront, and behind her—

"Holy shit…"

Every single one of them was stunning.

Rias looked like a princess straight out of a fairy tale, while Akeno and Xenovia oozed voluptuous allure in their daring dresses. Yumi and Asia exuded pure, innocent charm, while Shirone, no longer Koneko, was adorably dolled up in a frilly dress.

But the real showstopper was Kuroka.

Gone was her usual kimono—instead, she wore a body-hugging gown with a plunging neckline and an open back, her ample, massive breasts threatening to spill out at any moment.

"Goddamn—!!"

"KYAAA!!"

A sharp pain in his ribs made Issei yelp. Asia stood beside him, pouting as she pinched him.

"I know everyone looks beautiful, but you have to look at me, too!"

"Y-Yes, ma'am! Sorry!"

Issei barely resisted the urge to squeeze Asia in a hug, his heart melting at her adorable jealousy.

Before the mood could settle, a maid announced:

"Lady Rias, Lord Tannin, and his followers have arrived."

Escorted by Tannin and his servants, they soon reached the grand party venue at the edge of Gremory territory.

Tonight, Kazuki had been tasked with escorting Rias.

The moment they stepped in arm-in-arm, they were swarmed—nobles, devils, and dignitaries all eager to greet the Gremory heiress.

But the most annoying were the spoiled noble brats vying for Rias' hand in marriage. Their glaring daggers at Kazuki only made him smirk.

'Heh. Guess I've got competition.'

Rias' popularity was terrifying.

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