Deep underground in Shinagawa, Tokyo. Ark Dominion’s secret base was in the midst of its peaceful everyday life as usual.

「Sugar is essential to keep the body and mind moving. But eating too much of it is not good. …Alright, let’s go with this. There’s nothing unnatural about it.」

Walking down a hallway that was a little quieter than usual was Minato, a tall woman wearing a white lab coat and carrying a paper bag in both hands. Minato was heading for the room of the heinous mysterious Death Green, Kuriyama Rintaro, at the end of the long corridor.

「Rintaro and Kirika…… I wonder if they are here……」

For some reason, the two of them had been holed up in their room recently and hadn’t been seen at all.

It seemed they were doing some kind of important training, as there were screams and the constant sounds of banging coming from inside the room. Minato felt bad about disturbing them, so she left them alone, and before she knew it, three whole days had passed.

So she went out of her way to get some buns from the kitchen as a gift. With all sorts of thoughts running through her mind, Minato finally arrived in front of Rintaro’s room.

「……Rintaro?」

Even though they’re members of the same heinous legion, she can’t just open the door.

Moreover, special training often involves secrets. Minato’s natural inclination was to take not just one but two or three steps back, even with close friends.

Minato gently put his ear to the door to get a peek at what was going on inside.

From inside the room, she can hear the two of them talking, along with a strange ‘pechipechi’ sound.

『……Well, what’s wrong, Mayuzumi? You may act tough with your words, but once you’ve under control, you’re cute. Gehehehe……』

『Nnh…… Ah…… No senpai, that place…… Nh』

『Uhyahyahyah, is this your weak spot? Huh? If I poke a weak spot, you’ll be so fragile. Look, it’s going in.』

『Y- You caaaan’t!』

「Hawawawawa, Hahyaaaaaaah!!」

Minato was so taken aback by the unexpected cry that she collapsed into a heap. The buns tumbled out of the paper bag she was holding.

Minato tried to think of various things in her confused mind, but it seemed to her that there was no doubt that an extraordinary and lewd act was unfolding in the room right now. No matter how she tried to interpret it, the only way to interpret it was that Rintaro was taking Kirika hostage – stripping her naked, holding her down and poking her in her weak spots.

Minato’s face was burning red like a coal-fired oven, and steam and steak knives were rising from the top of her head like a boiling kettle.

Minato could never have imagined that the sexual situation of this heinous legion was so chaotic, without her knowledge or control. If she were to enter with an unsuspecting face, she might find herself in trouble, not to mention a chaotic situation.

「Awawa… what should I do… I never thought that Rintaro would attack Kirika…」

At that moment, someone tapped Minato on the shoulder.

「Oi, You.」

「Hahyaoah!!」

「Keep your heads up. On the battlefield, those who stop moving are the ones who die.」

The person, wearing military uniform, with bunny ears and an eyepatch covering one eye, picked Minato up into her arms. It was none other than the number two in the Hundred Beast Legion, Colonel Usanyi-chan.

「Ah, Aah. I- I’m fine now. I can stand up by myself. Rather than that, Colonel Usanyi-chan… why are you here?」

「Yes. Negadog called for help. I don’t know what happened, but Private Samecchi was with them, so I come to wake up Major Deathgreen.」

Cold sweat began to pour down Minato’s face. In addition, a dozen short kitchen knives called scramasaxes protruded from the hem of her lab coat.

As a member of the heinous legion, Minato was of course worried about Kirika’s chastity. But more than that, she feared that it would be really bad if Colonel Usanyi-chan were to catch them in the act.

Colonel Usany is strict with discipline, not afraid to use high voltage electricity to maintain good morals within Ark Dominion. Just the other day, one of the zako fighter who was hiding a dirty book was brought into the infirmary half-dead.

If she were to witness an assault on a woman, there would be no excuses and they would get into a bloody fight. Colonel Usanyi-chan may be the commander of another corps, but she will do what’s necessary.

In Minato’s mind, the image of Rintaro being torn in half by an enraged Colonel Usanyi-chan flashed through her mind.

「Wait! Wait, Colonel Usanyi-chan, let’s give a little bit of time!」

「What are you talking about, Chief Medic Minato? We need to send help right now.」

「Anyway, it’s not okay now! At least wait until he get dressed and call a lawyer!」

「You’re being a bit persistent. But I don’t have the luxury of being leisurely. Sorry, but I’ll have to push through.」

Colonel Usanyi-chan pushed Minato away and put her hand on the doorknob. Through the slightly opened door, she could hear the two of them talking.

『Aauhh! I give up! I give uuuup!』

『Hahahaha, it’s going pretty well for a first time isn’t it. Now that I’m finally getting used to it, let’s have another go.』

『Ugh, senpai, you can’t do that… consecutively…! My body has become such that I can’t be satisfied without senpai’s forceful rocket…!』

『You are making a good expression. Now I’ll show you a triple-stage rocket. Let’s see how deep it can go, Guhehehehe!』

Quietly, but surprisingly calmly. Colonel Usanyi-chan removed her hand from the doorknob.

「No, that… I’m sure Rintaro has his own reasons, and he seems to have been under a lot of stress lately. I’ll give him a word of warning too, so please give him a chance to atone for his sins and reform…」

In front of Minato, who was trying to make things right, Colonel Usanyi-chan quickly narrowed her eyes. Then she dropped her posture so low that she crawled on the ground.

「What are you talking about, Medic Captain Minato? I’m not angry at all.」

「Rintaro, run!! Colonel Usanyi-chan is serious!!!」

「Full Power Dropkick Usagi (Shoot)!!!!!」

At the same time Minato’s screams were heard by the two inside. Colonel Usanyi-chan’s full force special kick shattered the heavy ebony door into pieces.

「Whoa!? What’s with that all of a sudden!? I told you to knock before you enter, but you don’t need to do it that vigorously.」

「Shut up. Even a monkey can repent, but you won’t even be allowed to do that. Just regret your actions and die.」

Minato desperately tried to hold back Colonel Usanyi-chan, whose entire body was red with murderous intent.

「Waaaaaaah! Run, Rintaro! Shave your head at Mt. Koya and beg for forgiveness!」

「Wait a minute. What exactly did the wicked senpai do?」

「……Muh?」

Standing in front of Colonel Usanyi-chan was none other than Kirika herself, the presumed victim. Although she looked somewhat tired, there were no signs of having been violently assaulted, nor were her clothes in disarray.

「What is this? What on earth were you two doing behind closed doors?」

「……Haa, so you jumped to conclusions again.」

Rintaro sighed in disappointment as he looked alternately at Colonel Usanyi-chan and Minato, who were both staring at him in a daze.

「Listen guys, we weren’t doing anything shady. Right, Mayuzumi?」

「Yes. We put balls next to the gold and attacked each other’s weak spots. When I said it was my first time, I was squeezed and rubbed really hard.」

「Oh my? Mayuzumi, you don’t know the word shogi? Don’t tease her. She’s the one who can’t take jokes the most, so it could be a matter of life and death, seriously.」

Colonel Usanyi-chan, who had forced her way into the room, shifted her still angry gaze behind Rintaro and Kirika. There was the kaya shogi board that Rintaro had won at a bingo tournament.

Incidentally, the three-stage rocket is a type of aggressive attacking move in which three rooks and bishops are lined up vertically. It is by no means a shameful slang term.

「……………………」

Colonel Usanyi-chan silently looked behind her. There, the door, no longer resembling its original shape, was scattered like dropped cornflakes on the floor. Then slowly, bent down and placed her knees and hands on the carpet.

「……I’m sorry. I will accept any punishment.……」

「Don’t be hasty, Colonel Usanyi-chan. You’re here for something, aren’t you?」

「Ha! That’s right! Major Deathgreen, this is an emergency!」

Colonel Usanyi-chan came to her senses and summarized the rescue request she had received from Negadog.　

It turned out that Negadog, a member of the Hundred Beasts Corps, was under siege from Hero HQ and was on the run. However, what’s important to Rintaro is that Same-chan and all of the Heinous Legion’s zako fighters had been caught up in the getaway.

The atmosphere around Rintaro became tense, as if his previous relaxed state was a lie.

「Major Deathgreen, I have already sent the advance party of the Hundred Beast Legion. I will be leaving immediately, but I would like permission to accompany your troops if possible.」

「……Understood」

Rintaro immediately put on his jacket and checked his Death Green transformation gear.

「Mayuzumi, we need transportation. I’d like a fast wagon type car.」

「Understood.」

「There may be some injuries. Minato, please sort out the medical supplies. We’ll leave as soon as we load them up.」

「U- Understood!」

While giving instructions to Kirika and Minato, Rintaro himself took out firearms and grenades from the closet and stuffed them into his bag. It only took him about 30 seconds to get everything ready, and finally he picked up the “black sword” that was leaning against the wall.

「…………」

Suddenly, Rintaro’s gaze was drawn to the cardboard sword, “Fukahiremaru”, lying next to his bed. There had been no request for help from Samecchi, who was likely also caught up in the crisis.

「What’s the matter, Major Death Green?」

「……No, it’s nothing. Let’s go.」

As if shaking off a hint of anxiety, Rintaro left his peaceful daily life behind.

………………

…………

……

Chased by the light of day, those who lurk in the darkness tend to walk in the shadows. Deep beneath Shinjuku’s Kabukicho, a group was walking through an underground passageway with no end in sight.

They are the mysterious beings who aimed to escape from Shinjuku, bypassing the checkpoints set up by the Hero Headquarters.

「I haven’t heard from Nyanzo in a while, wan… She must be dead, wan… It’s so frustrating, wan… It’s so vexing, wan…」

「Uu…… It’s Samecchi’s fault, ssu…… Nyanzo, sorry, ssu……」

「Samecchi, there’s no time to cry, wan… We can’t let her precious sacrifice go to waste, wan……」

An hour had already passed since Nyanzo, the Nekomata mysterious being, was captured.

Leading the line, flashlight in hand, was Negadog, a negative dog mysterious being with an excellent sense of smell. Behind him is Shamechi, followed by the zako fighters of the heinous legion.

Bancholf, who united the zako fighters, spoke timidly.

「Ummm… Negadog. Why did Nyanzo have to take the risk to go back, oraui? Though she said she’d forgotten something…」

「………………Do you wanna know, wan……?」

Negadog stopped and shone his flashlight on his dog face from below without saying a word.

It was usually scary because it was done by  a human being, but if it’s done by Negadog with a face like a Shiba Inu it wouldn’t be scary at all. But after all, he was the veteran mysterious being with the most experience in the place, so everyone held their breath.

With an ever-serious face and voice, Negadog blurted out.

「…… It’s for a map…… showing the location of the Beast Legion’s hidden safe, wan…」

「That’s really bad, ssu!!」

「If that falls into the hands of Hero Headquarters… w- what will happen to us, oraui?!」

The situation was far more serious than Samecchi and Bancholf had imagined.

The Hundred Beasts Legion is the largest faction of the secret society, Ark Dominion. Their finances, which could be said to be their lifeline, were on the verge of falling into the hands of Hero HQ.

「I have the key, wan… But if they get hold of the safe itself, we’re screwed, wan… If we go home like this, it won’t end with just a spanking,  wan…」

Leading the Hundred Beasts Legion is General Bearion, the former head of the Great Beast Alliance, the Kanto region’s most militant organization, was like the embodiment of violence. If you were to seriously anger him, you’d likely not only get a spanking, but have your lower body and all of your buttocks ripped off.

The blood quickly drained from the faces of Samecchi and the zako fighters.

「Since it has come to this, the only thing we can do is get to the safe first and take out the contents, wan.……」

「Is that safe nearby, oraui?」

「It’s actually a secret, wan, but… I guess there’s no other way at this point, wan…」

With that said, Negadog stopped and sniffed his nose. He stared at an ordinary concrete wall.

However.

「……It’s here, wan……」

Negadog held up his hand and exerted force, and a section of the wall opened like a revolving door.

「Amazing, ssu…… A secret entrance, ssu!」

「It’s a secret underground passage that was closed after the war, wan… Come on, follow me, wan!」

From the depths of the darkness, where there was not a single light, a cold wind that sent a chill down their spine was blowing.

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