The sound of a thunder strike is muffled by the intense rain as an ominous dark castle comes into the view. Inside that castle, a group of four young adventurers are currently fighting the dark horrors residing within.

"Just go ahead! The mastermind is sure to be nearby!"

Such instructions came from a tall armored woman wielding a rapier. As the long blond hair of hers waved around, her blue eyes reflected on the boy's who she called on.

"Ghh! Fine! Just don't die, guys!"

Leaving behind the other three people, he slashed through the door with his sword and continued further into the castle. A young female's encouraging voice followed by a panicked boy's voice could be heard behind him, but he didn't pay it any mind. He had an absolute faith in his comrades.

With sweat splashing from his brown hair all around him, he ran through the long corridor onward. To his surprise, he didn't encounter any more of these shadowy monsters. Although it seemed suspicious to him, he was grateful for it nonetheless.

At the end of the hallway stood a giant door towering over him. As he gripped his sword with determination and stepped forward to try and break the mighty gate, it opened all on its own instead. That made him assume a defensive position as he stared at the female figure that appeared from behind the door.

"Hehehe... You have done well to get this far... But this is where it all ends! I will make this place your grave!"

Those words came from a black haired beauty in a purple dress, whose very appearance just screamed 'dark' and 'evil'. She wore a sinister smile as she sized up the intruder with her dark blue eyes.

"You... So you are the master of this castle?!"

As he shouted at his foe, his brain already worked on devising a strategy to take her down.

"Hahaha! That's right! Etch this into your mind boy, for my name is Anna Tagonist! The name of the most powerful dark mage in the world!"

After Anna made a triumphant pose and flashed an evil grin, the boy fell silent for a while... until he finally opened his mouth.

"...that's a really lame name."

"Ghu- H-hey!"

Her triumphant pose instantly changed into something one could only describe as 'a teenage girl reacting to being called fat'.

"W-what's your name then, huh?! I bet it's something even more stupid!"

And then it further changed into 'a childish tsundere girl trying to argue with an adult'.

"Not telling."

"Wha- No fair! I told you mine! So tell me yours!"

"That's your fault for blurting it out."

"Y-youuuuu...!"

And with that, she finally reached her final form, the 'kid throwing a tantrum'.

For a moment, the boy's mood shifted from tense to pitying and slightly disappointed. But it didn't take long before he assumed his combat stance again.

"Enough talk you evil wench! Let's fight it out!"

From the way she acted, he concluded that she was just a pushover, and so he wouldn't need any complex strategy to defeat her.

"Ghh... V-very well! You will regret angering this great Anna Tagonist!"

Using such speech, she did her best to regain some dignity she had lost in the previous exchange. But upon hearing her name again, the boy momentarily snortled, which made Anna cringe with anger.

Finally, the battle began.

Anna initiated by conjuring several orbs of dark magic and launching them toward her enemy. He, however, easily dodged them or used his sword to ward them off. Closing in on her, Anna summoned forth a giant monster made of shadows, similar to those the boy's comrades were holding back. Her opponent stopped his charge as he noticed the new foe.

"S-shit..."

"Hahaha! Already regretting you underestimated me?!"

But the boy didn't respond. His only reaction was squinting his eyes and clenching his teeth as a few sweat drops appeared on his forehead. The reason for that was simple... Ever since his party entered the castle, he really needed to take a leak... And the appearance of another foe meant he had to endure even longer. The boy found himself in a truly terrible predicament...

After a brief internal struggle, he decided to take a risk. A huge risk. With his left hand, he reached into his pocket and took out a vial of shining white liquid. It was his trump card. A potion to immensely boost his speed, strength and reflexes. But as expected, such a powerful potion had major drawbacks. These included muscle aches, upset stomach and an itchy butt. But in his situation, the most dangerous side effect was the fact that it was liquid, which would only make it harder to endure for him.

But nonetheless, he decided to risk it, and with a single swig, the vial's contents pored into his mouth. When that happened, the boy let out a roar like a wild animal and his body started to faintly shine.

"Hah! Do you think a mouthful of your mommy's breast milk will help you?!"

"S-shut up! Take this!"

In an instant, the summoned monster has been slashed in two and dispersed. That quick movement made Anna caught off guard. She tried to conjure more spells before he got closer, but it was already too late. The sword sunk deep into her stomach, and she could only stare at it in bewilderment. The boy then pulled the sword out and Anna collapsed on the ground. As she lied there, he walked right next to her and looked into her eyes.

"Haha...cough cough... Looks like you defeated me... Well then...cough...what are you waiting for... Finish me off..."

With that, she closed her eyes...

"Yeah, I should."

"Huh? Wai-GUHA!"

And then he stabbed her in the face, pulled the sword out and stabbed again. This motion repeated until her limbs stopped jolting from the sword's impact. After a little while, her head has turned into something that cannot be shown on a regular television program without a proper censorship. And following all of that, the boy kicked the side of her body to make sure she is really dead before letting out a sigh of relief.

"Phew... Now she won't tell anyone...

But really... how did she know this was enchanted breast milk...?"

...

As the boy walked to a corner of the spacious room and unzipped his armor pants to do the deed, something happened to Anna's corpse. Unseen by a normal being's eyes, the soul detached from the corpse and flew away. Out through one of the castle's windows, the soul flew in a straight line. Over a city, over a river and over countless trees until its path finally curved toward a strange house in the middle of a forest. It flew inside through an open window and found itself in a room with a bed, a table, a chair and three bookshelves stuffed with manga.

The soul stopped moving and just floated in the air as bright goo started oozing out of it. The substance situated itself on the bed and soon materialized into various things. First bones, then organs, muscles and finally skin and hair. After a moment, a perfect copy of Anna's body has been created. The soul then flew right into it, which made the body jolt.

At last, with her newly created body, Anna slowly opened her eyes and sat up on the bed while holding her head.

...

"W... WHAT THE HELL?! HE REALLY KILLED ME?! HOW COULD Heguhn..."

And with that, she flopped back down on the bed.

"Uuu... Always so weak right after reviving..."

And with that, she became unable to properly move for about an hour. Luckily for her, she was the only one in that house, so nobody could peek on her naked unmoving body. Unluckily for her, the wide open window meant a group of mosquitoes would later wander in and cause her to have a bad time.

Taken from Royal Road, this narrative should be reported if found on Amazon.

In the meantime...

"Phew...

So much better."

The boy, who finished his 'business' came back to look at the corpse of his enemy while scratching his itchy butt. But before he even reached her, voices of his comrades resounded outside of the room from the hallway.

"Are you okaaaay?!"

The source of that cute voice was a petite girl with short brown hair wearing a white magician's dress. The staff she was holding landed right in the boy's face as she jumped at him for a hug.

"Argh! C-calm down Lily! I'm fine! I'm fine!"

"This isn't the place for this you stupid siblings... Hiro, did you defeat the enemy boss?"

When the boy called Hiro looked behind his sister, he spotted the armored woman with blond hair.

"Y-yeah, I did. She's over ther-"

"YOUUUUUUUU!"

His report got interrupted by a guy who snatched him from his sister and grabbed him by the collar.

"HOW COULD YOU LEAVE US TO DIE AND GO TAKE ALL THE GLORY FOR YOURSELF?! I WILL NEVER FORGIVE YOUUU!"

With his bloodshot eyes literally crying blood, he shook his friend with full force. But he was soon pulled away from him by the girl in armor.

"Stop whining Kevin. We survived and the boss is dead. Isn't that all that matters?"

As armored girl scolded him, Lily snuggled back to her brother.

"Huh? Wait, what bo- AAGHHH!"

He looked around the room and spotted the mess that was Anna's corpse.

"W-wait! There are boobs! YOU KILLED A CUTE GIRL?! HIRO! WHAT IS WRONG WITH YOU?!"

Although his conclusion was reasonable, the thought process that lead him there earned him a scolding glance from the armored woman. Hiro, the culprit behind the state of Anna's head, let out a sigh as he knew this will take a while. Just like it always does...

...

Somewhere in the middle of a forest stood a very out-of-place house. Inside that house was a single person. A girl with messy hair and only dressed in a red shirt and white panties. Her arms and legs were full of mosquito bites.

"Ugh! Why are protagonists so terrible these days?!"

She continued using magic to heal her injuries from the battle with the vicious blood-suckers as she yelled out into the air.

"That guy is even worse than that party of three healers I met last time! 'We can't die if we keep healing ahaha!' ... Ugh... never mind, those idiots were worse."

As she kept on yelling, she exited her bedroom, walked downstairs and headed for the kitchen. Aiming for the fridge's door, she opened it and pulled out a carton of milk. After chugging a mouthful of milk, she continued her rant.

"Seriously! I was lying on the ground injured and he just stabbed me in my face! Aren't you supposed to say 'No! I won't kill you! Come join our party to atone for your sins instead!' or something like that? Who would actually kill their opponent like that?! Ugh...he doesn't read enough manga."

Dear reader, please note: It's the opposite. This person just reads TOO much manga.

"Gaaah! I even obediently waited for him to drink that potion and transform! Just like villains are supposed to! Come on now! This won't work if only I do my part!"

As she continued to yell, she made her way back up to her room. After looking at her bed with an annoyed look, she let out a deep sigh. It was because, although she didn't like that boy who mutilated her face, his party was the best one she met so far. And so, she decided to... 'become their antagonist' as she called it. And of course, her aim was the 'turns good and joins the hero's party in the end' scenario.

Hiro didn't notice it, but Anna cast a spying spell on him. Now, when she closes her eyes and focuses, she will be able to see and hear what he sees and hears.

"Nooow then..."

She then sat on top of her bed cross-legged and closed her eyes.

"I wonder what they are do- Ughpff!!!"

As soon as her vision changed into Hiro's she spotted something utterly disgusting right next to her face. Saliva burst from her mouth as she fell over while her eyes opened wide.

"WHA-WHAT IN THE WORLD WAS THAT?!"

...

Somewhere else, in a public bathing house, the boy's dressing room.

"Dude! Stop shoving your crotch into my face! It's disgusting!"

"You are just jealous! ...And it's your fault for crouching anyway."

"I had to crouch to put my clothes there!"

"Well it's not my fault that my locker is right above yours, so just deal with it!"

As these two kept yelling at each other, they both eventually undressed and put a towel around themselves before finally entering the men's bath. It was empty, so those two were the only ones in the men's half.

...

Meanwhile, back at the house in the middle of the forest...

"A..ahaha...they are in a public bath? What a timing... It's like I'm some kind of pervert peeking at them..."

With her face flushed red, she avoided eye contact with nobody in particular as her eyes wandered over the room. But she then tightly closed her eyes and slapped her cheeks a few times.

"Nonono, this isn't a peeking! I'm not a pervert! I'm an antagonist observing my foes! Just gathering info!"

Dear reader, please note: This is totally just peeking.

"N-now then... Let's keep listening..."

With her face's redness reaching the level of 'tomato', she closed her eyes again and focused.

...

"Now where do you think you are going?"

Hiro's hand gripped his friend's shoulder from behind with an aura of death around him.

"N-nowhere!

I was just...taking a stroll!"

"In a public bath?"

"O-of course! If you sit too long in that hot water, you will get a stroke!"

"We just entered two minutes ago."

"..e..err...well..."

"You just planned to peek on my sister, didn't you?"

"What?! I would never do that! Flat chests aren't my thing! I'm more into big boo-"

Before he even finished his sentence, Kevin's face caved in as he was sent flying back into the water. Anna, who saw all of this with her spying spell could feel Hiro's indifference when it came to checking if Kevin was still alive or not. After watching all of this unfold, Anna nodded to herself saying "Ah, so he's the pervert type of character. Almost every party has one...". And with that, she continued spying for quite a while.

"So there's the main protagonist character, Hiro.

His sister Lily.

The pervert Kevin.

And that last woman's name is Claire.

They have two melee fighters, one mage and a pervert...

It's not optimal but I've seen much worse teams..."

Saying that, Anna recalled the three healer party...'AHAHA WE ARE INVINCIBLE!'...and couldn't help but facepalm again. But after that brief pause, she started thinking.

"Hmm... What should I do now..."

She contemplated what she should do next as their antagonist. After all, they think she is dead now. So how can she make a cool comeback?

"It's gotta be kidnapping the heroine, right? Hmm... yes, let's do that!"

From then on, Anna started making something resembling a theater play for her grand return long into the night...

...

And, just in case you are wondering, yes, unfortunately the pervert Kevin survived.