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Kuroki only saw the darkness of the night when he opened his eyes. He was in an unfamiliar place, and his memories were rather hazy.
(Where am I? This is definitely not my room 
He was lying on a stone-paved floor, which felt cold to his skin.

 Skin?
(Eh? I’m naked?
He was completely naked.
Kuroki had no idea where his clothes were. He had never been an exhibitionist, but perhaps he had somehow suddenly awakened that fetish?
(Just when did I take off my clothes?!
As he wondered what had happened to him, he looked up. Above him was a gloomy-looking sky, no, a very high ceiling.
Kuroki raised his upper body and sat up. The floor he lay on had a strange circle on it that emitted a pale light. He looked around the room and his surprise only grew.
Despite the low light available, he could see several figures inside the room. Moreover, they weren’t human.
There were bird-like creatures, monsters with canine faces, people with tentacles growing from their bodies, even one that looked like a big eye. Although a few of them resembled humans, the majority had very strange appearances that didn’t look human at all.
(In movies and such, people usually scream when they’re put in this kind of situation, right? Just what the hell happened to me?!)
Kuroki was shocked at how ugly most of them looked. Most people would freeze in place, not knowing what to do in such a situation.
His train of thoughts short-circuited as he stared at a monster. So far, the monsters only watched him from afar and didn’t dare approach. Had they come closer, Kuroki would’ve screamed his lungs off. But since they kept their distance, he was able to keep calm.
(What should I do now? 
 Is this a dream?)
The cold floor beneath him was a clear indicator that no, he wasn’t dreaming. Kuroki’s brain was processing information at full throttle. He started questioning himself if maybe he was in Hell.
Was it possible that he died?
Suddenly, a voice came from above him, startling Kuroki out of his gloomy thoughts.
「Welcome to Our Palace! Our savior!」
(Savior? Who, me?)
Kuroki looked in the direction the voice came from. There was a noticeable gap in the monster enclosure that wasn’t there before. It was incredibly dark, but somehow he could see through it.
Upon a closer look, he could see a Giant Monster standing there. It looked like a bipedal boar with a huge horn on its head and very intimidating tusks growing upside down from its mouth. It also blew a black flame from its nostrils.
The splendid black robe it wore wasn’t enough to hide the violent aura it emitted from its entire body.
Part 2
The Giant Monster slowly walked past the other monsters and approached Kuroki, bowing its huge head to him.
「This one’s name is Modes, the one who’s called the Demon King and the ruler of the land of Nargol. Savior-dono, may you tell this one your name?」
「Ah
 Yes
 It’s Kuroki. Yukisaki
 Kuroki.」
The Demon King got even closer to Kuroki, who couldn’t withstand the pressure and sputtered out his real name.
「Ooh, so your name is Kuroki-dono! Then, Kuroki-dono! PLEASE SAVE THIS MODES!」
The monster bowed to Kuroki even deeper even though he could kill the human quite easily.
Kuroki couldn’t even understand the situation anymore.
「My apologies, but
 I’m still in the dark here. Can you explain why you need me to save you?」
Asked Kuroki in a timid voice.
「Oops, come to think of it
 I forgot about the explanation and jumped straight into asking for your help right after summoning you.」
Modes raised his head as he began explaining while slightly averting his face.
「The truth is, right at this very moment, Nargol is being invaded by enemies.」
「Invaded?」
「Yes, invaded. We were invaded by the Goddess of Elios, Alrena, also known as Rena. She summoned a hero from the Spirit World
 As if banishing this Modes to Nargol wasn’t enough, she went as far as trying to steal this Modes’s treasure
」
Modes had an extremely sad look on his face as he spoke. Suddenly, he looked at Kuroki and an eerie smile bloomed on his face.
「My request to you, Kuroki-dono, is to defeat that hero.」
Modes asked so without beating around the bush.
Hero, he says? It’s a word that I never heard before except in games and mangas.
As if Kuroki was inside a game

「A
 Hero?」
「Yes, a hero. The Braves or Heroes of this world aren’t strong enough to defeat this Modes. That’s why Rena summoned a hero from the faraway land of the Spirit World.」
Kuroki wanted to complain about the strange game-like development in the story.
“A Hero from another world” was a very common story template. Usually, it was a young Japanese man who got summoned by a Goddess from another world to defeat a Demon King.
And yet, Kuroki’s situation was the exact opposite of that template story.
(It seems I was summoned to this world by the Demon King to defeat the Hero. Aren’t I the villain, then?!
Kuroki was completely at a loss.
If everything that was happening was a dream, then he wanted to wake up.
「Kuroki-dono, allow this one to show you the figure of that Hero. Mona! 」
「Yes, dear.」
A woman walked out from the crowd of monsters in response to the King’s call. The moment she entered Kuroki’s sight, he felt as if time had stopped.
The owner of the voice was an otherworldly beauty.
Kuroki couldn’t take his eyes off of her.
From her beautiful and glossy black hair that flowed to the end of her back to her abundant, bulging breasts, her beautiful and well-ordered visage was made to capture the hearts of men.
The silhouette of her figure was easily discernible from her thin white robe, showing Kuroki her hourglass figure.
Such a beautiful woman!
Her beauty was even more prominent as she stood amidst the crowd of monsters.
Kuroki tried to hide his manhood as best as he could. He couldn’t show such an unsightly scene to that beauty.
「What do you think of her, Kuroki-dono? Isn’t she beautiful? Her name is Mona, and she’s my beloved wife. Mona, please give your greetings to Kuroki-dono.」
Part 3
Without batting an eyelash at Kuroki’s unclothed situation, Modes introduced Mona as if bragging about his wife’s beauty.
It was the biggest shock Kuroki had suffered so far.
This world-toppling beauty is Modes’s wife?! It’s like seeing Beauty and the Beast! Honestly, I’m jealous!
Modes, who had an atrocious appearance, showed a lovestruck expression on his face when he looked at Mona. It made Kuroki consider that contrary to how he looked, Modes might not be a bad person.
Kuroki felt his fear toward the monsters abate a little.
「It’s a pleasure to meet you, Kuroki-sama. 」
Mona greeted Kuroki with a smile on her face. A smile so charming it It was as if cherry blossom flowers were blooming behind her.
Kuroki ended up charmed by her smile.
[TL : MILF smile?]
「Mona, show the Hero’s appearance to Kuroki-dono with your magic.」
「Yes, dear.」
Mona muttered an incantation as she spread her hands. The area slightly above their heads shone brightly and some sort of mirage appeared above them.
It was the scene of a battle where swarms of monsters rushed toward humans. And yet, those humans were not having trouble defending themselves, despite the overwhelming number of monsters against them.
Kuroki took a good look at them. They were youths around his age, probably not older than twenty if judging by their appearances.
The party of humans consisted of one man and five women. The man swung his sword as he fought against wave after wave of monsters. His attire resembled the ones worn by Heroes in fantasy novels.
The women in the party also had fantasy-esque attires. One was dressed like a swordswoman, one looked like a ninja and the other three were dressed like sorcerers.
Led by the man, they fought vigorously against the army of monsters.
「Kuroki-dono, those humans are the Hero Reiji and his harem party.」
Modes was pointing at the sole man amongst the group of humans. Then, the image of the man enlarged.
Kuroki received another shock. The Hero’s face and name were extremely familiar to him.
「What the
? Is it really him? 
 Did you say that his name was
 Reiji?」
Midou Reiji, known as Reiji.
It was a very unpleasant name to Kuroki.
Upon a closer look, he could identify the women behind Reiji too, although they looked a bit different from how he remembered them.
One of the sorcerers was Mizuoji Chiyuki, the one with the beautiful black hair. The flaxen-haired woman behind her in white robes was Yoshino Sahoko, while the girl with hair in pigtails shooting fire from her hands was Sasaki Rino.
The tomboyish and petite girl swinging around her short sword happily was Todoroki Naomi. And lastly, the swordswoman with the ponytail was Kuroki’s childhood friend, Akamine Shirone.
All of them were famous beauties who attended the same school as Kuroki. And those famous figures were currently fighting in the image before him.