One hour before

Issei and Toma had finished their work as devils like usual and were on their way back to the club room.

"Hah… I can't get any contracts at all…"

"What is it, Issei?" Toma sighed while asked Issei if he was depressed.

"No… I couldn't get any contracts at all… the road for the Harem King is a long one."

"I see… I'm kind of the same way… I want to be promoted to higher level… but… well…"

Toma sighed again, as did Issei.

"Huh? What are those two perverts doing here at this time of night?"

"Onodera…?"

"Why are you here…?"

Saki appeared in front of them.

"I'm taking a walk, what are you two doing here? Peeping? Stealing underwear?"

"Huh!? We're not doing any of that!"

"We're doing club stuff!"

"Club stuff, huh… oh, I heard you two are in some weird occult club… what about it? Is it fun?" Saki asked.

"Eh? Y-yeah, it's fun!"

"There are couple of jerks, but we're in a man's dream… harem king…"

"H-hey! You'd better not say that!"

Toma covered Issei's mouth to prevent him from saying anything more.

"Well, it's a lot of work, but it's a fun club."

"Hmmm, right… well, good luck with that."

Saki then left them.

"Onodera is so cute, but she seems strange…"

"Ooh, is that what you call mysterious?"

They both said as they watched Saki's back.

Occult Research Club Room

"We're back…"

"Same here."

"Ara, welcome back, you two."

"Welcome home, senpai."

The two were greeted by Rias and Koneko.

"I'm back, buchou, sorry, I couldn't sign any contract…"

"Me too…"

"I see… well that's okay, it's just the way it is at first, don't worry about it." Rias said.

"You'll just have to try again…" Koneko added.

"Excuse me, buchou."

"Oh, Akeno… I thought you'd left…"

"I just received word from the Grand Duke that a stray devil has been found in this city."

"What…?"

Rias tensed at the mention of stray devil, and she told Akeno to call the rest of her peerage.

Near the ruins

"They were originally servants of a devil, and now there are those who flee or betray their masters and try to live freely…"

"Really…?" Issei muttered as he heard Kiba's words.

"I heard that stray devil is luring people to the ruins ahead and eating them."

"E-eat…? Seriously, Akeno-san?"

The thought of eating humans made Toma feel a little sick.

"There have been several casualties, and I've been ordered to take them out tonight."

"Well, as long as I'm around, I'll kill any stray devils right away, Akeno-san."

"Heh, that's right!"

Ryoichi and Eito, on the other hand, were overly confident.

But to be honest, Toma was worried. The power that they used as OOO and Ex-Aid was indeed amazing, but they were overconfident with their power and relied on it so much that he began to wonder if it was really useful. Then Koneko heard the sound of battle coming from inside.

"Buchou… there's a noise coming from the ruins…"

"Noise? I don't know, but we're going in!" Rias told the others and slammed the door open. "Stray devil Viser! I'm here to eliminate you!" She declared to the stray devil, Viser, who was probably inside.

However, it wasn't just the stray devil that was there.

"Huh!? You people!?"

"Brave! Lazer! And Zangetsu and Duke, too!?"

It's not only the stray devil, but also Brave, Lazer, Zangetsu Shin, and Duke, who had beaten them to a pulp the other day.

Meanwhile, Brave was shocked to see the scene in front of him. Among Rias' peerage was Koneko Toujou, the patient he had operated on before.

'Why is she… could it be, she's a devil…?' He thought.

"Well hello there, Gremory peerage, you've arrived quite late." Duke said to Ria and the others a bit mockingly.

"You are the ones who attacked us the other day… I think Ryoichi told me your names are Duke, Zangetsu, Brave, and Lazer?"

"Duke, Zangetsu? …Ooh, you mean us, by any chance."

"Yes, that's right. Well, now that we've got that out of the way, what are you up to?"

"What are we doing? Hn, operating, of course." Brave answered Rias' question.

"Operation? …I don't know what you're talking about, but I've told you before, this is the territory I've been entrusted with by the Demon Lord, and as the ruler of this land, I can't overlook you people for trespassing without permission…"

"Hmph, rubbish…" Zangetsu Shin scoffed at her words.

"Excuse me?"

"I said foolish… you think this land is your territory? If that's the case, why don't you manage it a little better… Because of your negligence, an estimated eight people were eaten alive by that writhing stray devil, and how do you plan to take responsibility for that!?"

"You bastard! How dare you talk to buchou like that!?"

"Buchou is doing her best too! You know that!"

"Silence, you're trying? You're working hard? Don't be so naïve. Management is not a game! Every decision you make will have a great impact on the fate of all the people living in the city, it's natural to work hard, what's important is the result, and this is the result."

Zangetsu Shin pointed to the dismembered corpses floating in the sea of blood as he spoke.

"It is unacceptable to claim only one's position and rights without considering one's own responsibility and failures while producing such a disastrous result. Let's face it, you're a failed ruler!"

Takatora, the true identity of Zangetsu Shin, is not only a Rider, but also the CEO of Yggdrasill Corporation, a huge corporation with branches all over the world and tens of thousands of employees. From his point of view, the way Kuoh was being managed was sloppy. In addition, he'd heard that the way to deal with the bereaved families of those killed by stray devil is to erase the memories of those killed. Memories of a family member, a loved one, gone. He began to feel anger towards them, who were so vocal about their position and authority.

'W-what is he… from his looks, he must be human… but the weight of his words…'

'Just who is that guy… and who is Zangetsu…'

'Buchou is so overwhelmed… who is he…'

Rias, Toma and Issei were overwhelmed by Takatora's words and thought. But just as Rias was about to calm down and regain her composure…

"I have a question for you."

"…What is it?"

This time, Brave spoke to Rias.

"What are you going to do if we listen to what you have to say and leave this place?"

"…Well, we're going to exterminate the stray devil, of course."

"…And by 'exterminate' you mean kill?"

"Yes, because that stray devil is eating people, and if we don't kill it, we'll have more victims…" Issei said to Brave, who made eye contact with Lazer, Zangetsu Shin and Duke.

"If that's the case, then I can't just leave here. If anything, it's you who should leave. You're interrupting the operation, get the hell out of here!" Brave shouted to Rias and the others who had declared their intention to kill the stray devil, pointing his Gashacon Sword at them.

"Why you! How dare you!"

"You're fools to protect a stray devil!"

"No, it's not that we're stupid, it's just that you're incompetent!"

Lemon Energy Sparking!

Duke who retorted to Ryoichi and Eito instead of Brave, pressed the lever on the Genesis Driver and brandished the Sonic Arrow to corner Rias and the others, sending an energy slash flying.

"""Kyaa!"""

"""Uwaaaah!"""

The smoke and shockwaves from the explosion hit them.

"You bastard! Unforgivable!"

MIGHTY ACTION X!

"You're humans and you're insulting buchou! Buchou! I'll kill them and the stray devil!"

Ryoichi and Eito were angry and yelled, each wearing a driver.

""Henshin!""

Gashat! Gachan! Level Up! Mighty Jump! Mighty Kick! Mighty! Mighty Action X!

Taka! Tora! Batta! Ta-To-Ba! Tatoba! Ta-To-Ba!

"OOORRRRRRRAAAAAAAAA!"

"DAMN YOU BASTAAAAAARDS!"

They transformed, and Ex-Aid took out the Gashacon Breaker while OOO used Medajalibur to attack Zangetsu Shin.

"Ha!"

""GAAAAAAAAAAHHH!""

OOO was cut down by Zangetsu Shin's Sonic Arrow, while Ex-Aid was blown away by Duke's Sonic Arrow blast.

"Now that we've declared war, let's do it."

"Yeah, let's go!"

The two brandished their bows and began to attack the peerage.

"Huh, it's bound to happen sooner or later. Prodigy, we'll take care of them, you continue with yours."

Shakariki Sports!

"Third Gear."

Gashat! Gachan! Level Up! Bakusou Bike! A Gacha! Shakariki! Shakariki! Bad Bad! Shaka to riki to Shakariki Sports!

"Oho, I was wondering what was going to happen, but it turned to be humanoid… Mr. President, good job! All right! Now we're revving it up!"

Lazer Shakariki Sports Bike Gamer then headed towards Rias and the others.

"Take care, Examiner!"

Brave, on the other hand, left the interception to Lazer, Zangetsu Shin, and Duke, and continued the operation.

"Eito! Ryoichi! Ugh! It looks like we have no choice! Let's go, everyone!"

"""Yes, Buchou!"""

They turned to the Riders.