Hello, world! So, I know this is not a popular opinion, but I totally love Muzan! I'm not sure why, but I just love the guy! I think I might have a thing for bad boys... Oh well! Just be aware that this has major manga spoilers. Don't read if you haven't red pass chapter 70. I do not own Kimetsu no Yaiba or its characters. This is purely fanfiction for fun.


What would you do for the ones you love? Would you die for them? Kill for them? Would you be willing to make a deal with the devil? For Kamado Tanjirou the answer was simple. He would do anything for his loved ones. He would risk his life and soul to turn Nezuko back into a human.

It was a not-so quite night in the Red-Light District. Tanjirou was buried underneath his futon, trying to cancel out the noises coming from the rooms next to him. The moans and grunts that some of them men and women were making were starting to make Tanjirou feel uncomfortable.

According to the Hostess, every night was a busy night for them. Tanjirou's ear could clearly attest to that. It was way late into the night, the sun would rise in a few hours, yet so many women we're still entertaining men.

Not a single customer had requested for 'Sumiko' tonight, so Tanjirou was ordered to do housework and tend to the women's needs between customers. Once there was nothing left to do around the house, Tanjirou was dismissed and sent to rest. Tanjirou went to his room with the intention to rest his eyes only for a few minutes. He would sneak out of the house as soon as the coast was clear. There was a demon on the loose, and Uzui-san was depending on him and the other two to search for his three wives. He could not afford to sleep for very long, not while people were being threatened by a demon.

That was initially his plan, but…. How can he possibly sleep with all those embarrassing noises!? His virgin ears could not possibly cope.

"Sumiko-chan? Are you awake?" a gentle voice spoke from outside Tanjirou's room. It was one the girls he spoke to earlier. If he remembered correctly, her name was Yukino-san. "You have a guest. She would like to speak with you now."

Tanjirou rose from underneath the plush covers of his futon. "Yes…" Suddenly, a putrid smell of blood and death filled his nostrils. This familiar, overwhelming smell of blood…. It could only belong to one person.

No! Not a person! This scent… It belongs to HIM!

The demon slayer rushed to slide the tatami doors open. "You monster!" He expected to come face to face with the devil himself. He did not expect to come face to face with a sinfully beautiful woman like the one staring at him right now. And this smell… It was the same smell of blood and death he detected last time he saw him, but something was different about it this time. She was different.

"Oh, my. When your hostess said that the new girl was rather spirited, I did not expect her to be this excitable." The pale beauty said with a smirk. Her voice smooth and gentle, like that of a noble lady.

"P-Please forgive her abrasiveness, Yukihime-sama! She has not been here very long."

"Even if she hasn't been here very long… You people should at least take the time to teach yourselves some manners! She just accosted Yukihime-sama!" A third voice spoke angrily.

So consumed he was with the source of the putrid smell of blood, Tanjirou did not notice the third woman present. She was fair skinned with yellow hair and light, green eyes. She dressed in a silk blue dress and black gaiters. Her Japanese was impeccable, but Tanjirou could detect a slight accent in her speech. She must be a foreigner from another country. Tanjirou could not possibly guess where this blonde woman was from, he had never met anyone outside from Japan, but he could clearly tell she is not a demon.

"I deeply apologize, Yukihime-sama!" Yukino bowed her head in apology. "If you would please wait in your usual room, I promise I will bring you and your guest our best tea. Sumiko-chan will join you shortly, as soon as I have a talk with her."

"There is no need for that, Yukino. Anne was just being overprotective as usual. I would just like to be alone with 'Sumiko-chan.'"

Tanjirou's hands twitched. Just being around this person made his blood boil and every muscle in his body scream to cut his, or rather her, head off right now. "I-It's alright, Yukino-san." He said through clenched teeth. His glaring eyes never left those red rubies. "I promise I'll behave."

"W-Well, if you insist." Yukino glanced between the two of them nervously. She cleared her throat uncomfortably. "If there is anything you ladies need, I won't be far." Her nervous glance was the last thing she gave them before she turned her back to leave.

Once Yukino was out of eyesight, Tanjirou moved to strike. "You! You can't fool me, Kibutsuji Muzan!" He did not have his sword on him. Instead, he went straight for her neck with his bare hands.

But just before he could make contact with the monster, a sudden hard punch to his open neck left him breathless. It took everything in him to fall on his knees from the sudden loss of breath. Before he could even retaliate, a heeled shoe kicked him in the stomach. Hard. The poor demon slayer landed on his back, several feet away from where he previously stood. The force of the kick alone made him want to spill the contents of his stomach out, but the pain of having his trachea punched kept him from throwing up.

"Try to lay one filthy finger on her again, Scum! The next time you try, I'll break every bone in your body!" The foreign woman shouted. She stomped over to Tanjirou and dug her heeled shoe on Tanjirou's aching stomach. "Where is it!? Your nichirin sword!I won't allow you to speak to Muzan-sama until you hand it over!"

Tanjirou's hands grasped her foot, trying to get the pressure off his stomach. "I won't tell you!"

"He doesn't have it." Muzan said casually as she entered the poorly lit room, closing the doors behind her. "I don't sense the presence of nichirin steel. He's completely defenseless, Anne."

"Y-Your h-human. You know what she is." Tanjirou stated rather than asked. "A demon!"

"Yes. What of it?" She glared at him intensely.

Tanjirou glared at her in return, more out of confusion than anger. "Why!?"

Anne did not bother to answer his question. Instead, she dug her heel in deeper.

"Anne's connection to me is none of your concern, Kamado Tanjirou. You should be more concerned with the reason why I have decided to come visit you tonight." Muzan, like a predator nearing its prey, stalked over to him.

"I don't care why you're here!" He hissed. "I promised myself I would avenge my family! I swore I would lop your head off the next time I saw you!"

Muzan pressed her lips together, trying hard not to burst out laughing. "How interesting! You actually believe you have a chance at accomplishing such ludicrous goals?" She smirked. "You barely could anticipate Anne's movements, and… As you just pointed out, she is merely human. If you cannot even defend yourself against an ordinary human… How can you possibly hope to defeat me?"

All she received in response was a growl and a frightening glare.

"Oh well… I did not come all this way just to watch you humiliate yourself." She elegantly sat beside him. Her knees barely inches away from his face. "I've come here to offer you a proposition that will benefit the both of us."

"I don't make deals with devils!" Muzan's feminine hard grasped his chin. Her sharp nails dug into cheeks, drawing small drops of blood. His face was forcefully turned to make eye contact with her. He hated this creature! There was absolutely nothing that he wanted from her. Other than her death. "Not even to turn your sister back into a human?"

His heart skipped several beats.

"Tell me, Tanjirou… What would you be willing to do for the sake of her humanity?"


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