Even among the strongest in the Underworld, Sirzechs-sama's peerage is widely acknowledged as elite. Though Grayfia-sama are currently absent due to guarding Ikki-kun, the remaining members are still incredibly formidable.
Some, including my own mentor, excel in close-quarters combat. Their raw power is so intense that even a stray shockwave could kill any nearby regular soldier — which is likely why they're fighting alone without outside interference.
As for the miniature magical beasts (who all appear as beautiful women) being spawned, my mentor, being both a swordsman and someone who hosts numerous youkai within his body, seems to be handling them without any issue.
Meanwhile, the supporting forces from other factions here are focusing on ranged, concentrated attacks aimed primarily at the upper bodies of the giant magical beasts. The beasts are large enough that we don't need to worry too much about friendly fire, which is helpful.
"Ngh… This isn't how I imagined providing support. I can't just barge in where Sirzechs-sama's peerage is coordinating so perfectly," Sairog-san muttered.
I feel the same. My Holy Demonic Sword can only maintain its full power at medium range. At this distance, any slash I launch will have lost much of its impact by the time it reaches the enemy.
But that's only true for my current weapon.
While heading to regroup with everyone, I retrieve Gram — the sword I'd stored in subspace.
"Geh! Kiba, what the hell is that sword?" Issei-kun flinches backward, overwhelmed by the oppressive aura — a dragon-slaying curse — leaking from the blade the moment I unsheathed it.
"This is Gram — the sword once wielded by Siegfried. Along with the other demonic swords, it seems they've all accepted me as their new master."
"For real?! You disappear for one mission and come back this buffed?! Man, I can't take my eyes off you in mock battles anymore — not that I ever let my guard down to begin with!"
Haha. Hearing that from you, Issei-kun, is an honor.
But with Gram, I can launch slashes imbued with aura strong enough to pierce those beasts.
"I see. You're launching ranged slashes. In that case, I'll cast my doubts aside too. Regulus!"
"Yes, my King!"
At Sairog-san's command, Regulus shifts from his lion form — not into armor like I expected, but into a massive battle axe that slams into the ground. Sairog-san lifts it with ease.
"Regulus can also take the form of this battle axe — a weapon said to split the earth with a single swing! If it can cleave the ground, it should be able to cut the air too!"
That logic is a bit questionable, but I suppose for someone like him, it doesn't really matter. He'll probably send shockwaves flying anyway.
"Alright, then let's move ahead with the plan! Rias, Akeno-san, Asia, Xenovia — I'm counting on you! With the flames keeping that beast's form mostly hidden, now's the time to wipe it out!"
"Understood! Leave it to me, Issei!"
"My my, ufufu~ I won't lose to Xenovia-chan today."
"I-I'll do my best for you, Issei-san!"
"I'm the first to be poked! That's my role, after all!"
The girls proudly thrust their chests forward. You're all way too comfortable with this by now! I turned away, but not before they ended up in my peripheral vision again…
"Oh-ho! So Hyoudou Issei is going to poke their breasts? With just Rias's power, he already unleashed that much strength — with the others added, this might seriously wound that beast!"
"Yes, Sairog-san! I'm getting so emotional right now! Could you help buy me some time while I poke everyone's boobs?"
"Of course! Kiba Yuuto, let us assist Hyoudou Issei in drawing power from his comrades' chests!"
That's not wrong—and it's because it's not wrong that hearing it stated so directly makes my body go limp…
While Issei-kun carried out his sacred mission, those of us not involved added our own attacks into the barrage of magic launched by the various forces. My own slashes, and Sairog-san's, seemed to be landing cleanly, tearing through the beasts' bodies.
And then—
"Nn~"
"Ahhn"
"Mmm"
"Haau"
The girls' moans rang out clearly behind us... Sometimes, I curse my devil-enhanced hearing.
Anyway, the order was: Rias, Akeno, Xenovia, then Asia.
Then came Issei-kun's ecstatic shout.
"It's here! It's happening!"
I turned to see him glowing with a deep crimson aura tinged with a… pink hue? Is that the "Oppai Power"? The aura burst forth, his twin cannons locking onto the beast.
"Issei! I've alerted Sirzechs-sama's peerage to your blast! Fire at will!"
"Roger that! Let's do this! Dragon Oppai Blaster!!"
"…What a terrible name. The worst, really," Shirone-chan deadpanned.
With her dry comment echoing, Issei-kun unleashed his ultimate attack powered by "oppai energy." The blast hit the upper body of the monstrous Jabberwocky dead-on.
"Did we get it!?"
"Issei-senpai! Didn't you learn from the Kokabiel incident?! That's a death flag!"
Shirone-chan had a point. But after seeing that kind of attack, you could be forgiven for thinking it worked.
And yet… as the smoke cleared, the beast still stood — with a gaping hole from chest to stomach, but still alive. Worse, the wound was slowly regenerating.
"Don't just stare! Don't let that hole close! Keep bombarding it!" Sairog-san recovered quickly, firing again. Seeing him, devils, fallen angels, youkai, and valkyrie allies resumed their barrage.
"Damn it! Even that wasn't enough!?"
Issei-kun's frustration was palpable. To see his prized "Oppai Power" fail to finish the job must have cut deep.
Then, from the sidelines, Rossweisse-san quietly said:
"...Looks like it's time I made up my mind. Irina-san, that includes you too."
"H-Huh?! Me? What do you mean, Rossweisse-san?"
"Exactly what it sounds like. We have to offer our breasts to Issei-kun as well. That last shot did massive damage. If we add our energy on top, he can likely surpass it — and finally take down that beast. The only ones left who can give him Oppai Power now are you and me. Asking Shirone-san would probably result in Ikki-kun killing Issei in a moment of righteous fury, so that's out."
Of course! If four boobs weren't enough, six will be! With the additional energy, Issei-kun could fire an even greater Oppai Blaster!
...I'm starting to feel like my mind's unraveling. But maybe that's just part of being in the Gremory household.
"Rossweisse… You're actually going through with this?"
"This is a crisis threatening the entire Underworld. If I can help resolve it with something as simple as my shame, I must. I'm still single anyway, so it's not like I have anything to lose. Fufu… Fufufufufu..."
Rossweisse-san… don't spiral into self-deprecation! She's beautiful and competent — someone will surely propose to her someday… probably.
"F-Fine! This isn't lewd! This is for the salvation of the Underworld! If I think about it like that, I won't fall! I'll let him poke my boobs too!"
"WHAAAAT!? Are you serious?! A demigoddess valkyrie AND a literal angel?! This is a ★5 combo, easily! Though I guess Rias and the others are ★5s too!"
As Issei-kun's excitement hit its peak, Rossweisse-san and Irina joined the lineup — offering their chests to fuel the final attack.
"Ahhn"
"Nn"
"Mm"
"Ah"
"Kyaa"
"Uugh"
This time, the order was: Rias, Xenovia, Asia, Akeno, Irina, and Rossweisse.
Please… let this be the last time.
"UOOOOOOOOHHHH!!! THIS IS IT!! Nyuutron Beam Cannon!!!"
The massive beam exploded from Issei-kun's cannons, obliterating the Jabberwocky from the waist up. Whatever core it had must have been destroyed, because the remaining lower half crumbled into ash.
Everyone finally let out a breath of relief. The magical beasts had all been defeated.
But just then, a powerful pressure washed over us — unmistakable, even to someone like me who isn't good at sensing things. This aura… it belonged to Death Gods.
Thanatos. Pluto.
What are they doing here now, of all times!?
"Ah—!! There's a Death God… and I can sense Ikki-senpai with them!"
What!?
Ikki-kun should be back in the Gremory territory, protected by the best — including Grayfia-sama! How did they get to him!?
"They're not far. Everyone — move out, now!"
With Rias's order, we flew full speed toward the source of the disturbance.