There was a female swordsmith that had approached the Rengoku Residence door. A woman in fact. She had worn a dark brown kimono, over a white haneri inside with a yellow otaiko wrapped around her waist. She had worn a light pink hyottoko mask with a peach fuzz on it and the eyes were squint. Her hair was tied in a short ponytail. She had also worn long white socks and brown sandals. She also wore a dark brown ponytail. Her name was Chiyo and she is twenty-two years old.

"Is Natsu Rengoku home?" Chiyo asked.

Senjuro paused as he stared at the swordsmith. 'It's a woman...' He heard the feminine voice from her then bowed his head towards the swordsmith. "I'll get him. Please excuse me!" Senjuro then closed the door, leaving the swordsmith outside his residence.

Chiyo paused as Senjuro politely closed the door.

Meanwhile, Natsu was dressed in his Demon Slayer uniform, training with a wooden katana. He grunted repeatedly as he practiced swings over and over for ten minutes within the Rengoku Residence training grounds, until Senjuro had ran outside catching his attention.

"Hey, Natsu!" Senjuro called.

Natsu stopped swinging with a wooden katana for a moment as Senjuro had caught his attention. "Did something happen, Senjuro?" Natsu asked.

"The swordsmith's outside our residence. We can check out your Nichirin sword!" Senjuro had informed Natsu the news.

Natsu paused for a moment as he thought about his newly forged Nichirin sword. He dropped the wooden katana in his hands, grabbed Senjuro's shoulders. "What are we waiting for? Let's go!"

"Right!" Senjuro responded.

Natsu and Senjuro then rushed inside the house and decided to rush to the front door. As they had opened it, they saw the swordsmith standing and looking irritated. She tapped her foot repeatedly and crossed her arms.

'It's a woman...' Natsu thought as he gazed upon the swordsmith.

"You may address me as Lady Chiyo. I am the one who forged Natsu Rengoku's Nichirin sword." Chiyo said.

"I'm Natsu Rengoku." Natsu introduced himself.

"May I come in?" Chiyo asked.

"Sure." Natsu opened the door wider to let the swordsmith in.

After closing the family door, the three had all walked in the living room and sat down. Both Kyojuro and Shinjuro were absent at this time. Kyojuro is currently taking an assigned mission and Shinjuro was currently at the liquor store.

"I apologize for being days late. As a swordsmith, it is my job to make sure that my baby was extra special and durable..." Chiyo said as she opened the box.

"B-baby? What baby?" Natsu asked.

"This." Chiyo took the Nichirin sword out of the box.

"Your baby turned into a sword?" Senjuro asked.

"No, silly. That's what I call all the swords I build. My babies. My creations." Chiyo answered Senjuro's question. "You see, it takes two people to make a normal baby. But it only takes one swordsmith to make a sword and call it their baby. I forge these Nichirin swords with love, care, kindness and compassion. They are precious to me, like how human babies are precious to people."

"So, you're like the sword's mother..." Natsu had caught on.

"That's right." Chiyo nodded.

Like most swordsmiths, Chiyo is very prideful and protective of her forged weapons. She loves her weapons more than she loves her own parents, whom had introduced her to Swordsmithing. Chiyo loves her weapons so much, that she call her masterpieces her babies. She does not have kids of her own.

You must be a bright kid." Chiyo said.

"Bright?"

"Yes. Your name, Natsu. It means... Summer. And that bright red hair of yours... You must come from a household that works wit fire. You must have great fortune, though."

"Sorry, but I don't know what you mean. I was raised by Shinjuro and Ruka Rengoku." Natsu proclaimed.

"Oh," Chiyo removed her hat. "Well since you born with red hair and the fact that you were trained and raised by the Rengoku Family, I suspect that your Nichirin Sword might turn red." Chiyo assumed. "Go on, draw your sword."

"Yeah, do it, Natsu." Senjuro said feeling a little excitement.

"Okay." Natsu then looked at his sword then drew it from its sheath. Natsu held the long katana by the hilt and stared at its silver blade.

"It's also called the color changing katana. Depending on the emotions the wielder is feeling." Chiyo added.

Seconds later as Natsu is holding it, he notices that the back of the blade started to turn to a certain color. He and Natsu gasped as the blade had suddenly turned jet black.

"Whoa..." Natsu gazed at the jet black color of the katana.

"Your sword, Natsu. It's black!" Senjuro pointed out.

Natsu glance towards Chiyo. "Um, miss Chiyo? Does this mean anything?"

"Hmmm..." Chiyo thought for a minute, but couldn't think of anything. "Honestly, I don't know... I've never witnessed one of my babies turning black before... I guess you could think of it as a sign of good luck..." Chiyo said.

'Good luck...' Natsu closed its sheath. "Okay. I wish Kyojuro and pops were here. They probably know what this means..." Natsu thought about his brother and father for a moment.

"And don't break my baby." Chiyo added.

"Right. I can imagine how much effort it took for you to make this baby- I-I mean, sword. I don't want to dishonor you by breaking it."

"I see that you like to respect other people's property. That's good. But just to be fair, I may as well warn you what would happen if you do..." Chiyo walked close to Natsu's face to where part of the hyottoko mask nearly made contact with Natsu's nose.

"M-Miss Chiyo?"

"If you do break, snap, chip or even crack my baby... there's going to be SEVERE consequences." Chiyo said in a dark edgy voice. Red aura had surrounded her body, and both Natsu and Senjuro could feel the tensions. Natsu wince a centimeter when he heard the word SEVERE.

"Caw! Caw! Caw!" a crow squawked.

"Hm?" Natsu, Senjuro and Chiyo all hear the sound of a bird squawking outside of the Rengoku Residence.

"Is that a bird outside?" Senjuro walks to the door and opens it. Natsu gasped as the squawking crow immediately fly pass him and into within the residence, passing Senjuro and flying towards Natsu.

"It's a messenger crow..." Chiyo stared at the crow.

'Wait a second...' Natsu had a small flashback within his mind and remembered at the end of the Final Selection Exams. He was given a crow as soon as he received his Nichirin sword. 'That's right. We were giving crows at the end of the Final Selection Exams.'

"Natsu Rengoku! You are to head far east! Far east! Far east! There is an ominous demon that has invaded the Tszumi Mansion! You are to travel there and slay the demon, immediately!" the talking crow informed Natsu.

"I-it talked!" Senjuro jumped a bit, as he hadn't heard of a crow talking before.

Natsu paused as he heard the crow correctly. A smile had slowly formed on his face as he gets to go on his first mission. "Alright! I get to go on my first mission!" Natsu jumped up and stretched his arms out in the air.

"Um, are you ready to go on your first mission?" Senjuro asked Natsu.

"Yeah. I've been training for a long time for this." Natsu answered, then ran to one of the closets in the house and opened the sliding door. He looked at the number of different styled haori and picked out a black Haori with orange flame patterns and picture of an orange phoenix on the back. He took it off a hanger and immediately put it on.

A few minutes later, Natsu, Senjuro and Chiyo the swordsmith stood outside the Rengoku Residence. Natsu was about to be sent off on his first mission.

"What do you guys think?, Senjuro?"

"You look fantastic." Senjuro noted as he checked out Natsu in his Demon Slayer attire, plus his flaming haori. Also giving him a thumbs up.

"Thanks. Well, I better get going, now-

"Hold it!" Chiyo yelled before Natsu could out the door.

"Uh, yes miss Chiyo?" Natsu stopped and turned.

Chiyo pointed towards Natsu. "Remember what I told you about if you damage my swords! I'm not kidding!"

Natsu bowed his head towards her. "Thank you for the warning. And thank you for the Nichirin sword! I promise to special care of it." He said as he gripped the hilt on his side.

"You better give it the best care, too, you know! I will find out!" Chiyo yelled with worry and expectations.

"Thanks for the advice! I'm already heading off now!" Natsu started running with his flame-like haori and his new Nichirin sword.

"I'll tell Kyojuro and father everything!" Senjuro happily yelled as Natsu departs.

"Thanks! I'll try to make it back in one piece!" Natsu said as he started running off towards the mansion.