Kagami, Tanjiro, Zenitsu, and Inosuke walked through the quiet aisles of the train beast's belly. Many people sat contently on their red leather seats, sleeping, dozing, or mumbling happily with each other. They all were getting some rest and doing their best to stay quiet. It was almost the middle of the night and it was pretty dark out. It was fascinating to see how people who didn't grow up in the country or in the mountain travel. All she ever knew was walking and running. To place such trust in a mechanical beast to take them to their destination was almost nerve wrecking. Nonetheless, they all did their best to not appear out of place or out of sorts with modern-Japan.

Well, three of them were at least.

Inosuke was still giggling and laughing like a maniac through the cars the train was pulling. He rudely invaded many people's personal spaces, waking them up and causing them to growl in anger, as he excitedly jumped from window to window. Zenitsu acted as his personal bodyguard, or handler more like, to keep them from possibly being ejected from the mechanical beast. He tugged Inosuke along, pulling him by his pants, flushed red with embarrassment. Kagami smiled at a little girl and patted her head while Tanjiro helped an elderly couple with their luggage.

So many different people were traveling. Their reasons must've varied and must be different from each other. That family she walked by must be seeing the rest of Japan, that elderly couple must be seeing their children or their grandchildren, and those classy-dressed men must be on a business trip. While they were there to find and kill a demon, those people were living their best lives without the worry of such monsters. Kagami could only hope to keep it that way.

The four of them traveled from car to car. They were supposed to rendezvous with Mr. Rengoku but couldn't see him anywhere. Kagami didn't know what he looked like to begin with but Tanjiro walked with confidence.

"This Rengoku, he's a Hashira, right? You sure you'll recognize him?" Zenitsu asked curiously forcing Inosuke to follow them.

Tanjiro smiled and nodded his head. "Yeah. Along with his fiery hair, I remember his scent, too. I'll tell you when I sense him."

When he got no reply, Kagami and Tanjiro turned back and saw Zenitsu fighting Inosuke. He had saw something interesting through the window and was about to disturb a family when Zenitsu roughly pulled him away. She thought she outta step in... but Zenitsu seemed to have a handle on things! He was doing a job well done and she'll let him deal with it. She was also totally not avoiding taking responsibility for what Inosuke is probably going to do next.

Kagami placed her hand on the door to the next car-

"TASTY!"

They all gasped and yelped at the loud voice that boomed clearly from the next car over. Even the people sitting minding their own business turned to see what the ruckus was about. It was so loud, so... proud, and so enthusiastic, she could feel their voice in her rib-cage! Something about tasty and food? She was scared to open the door all the way but she had a feeling that voice belonged to the person they were looking for.

Slowly walking down the aisle, their eyes fell upon the fiery, bright, and colorful red and yellow hair Tanjiro had mentioned. His hair stuck out like a sore thumb against the dark brown, green, and maroon colors of the car. Many people's eyes watched and laid still, staring uncomfortably, at the young man who was sitting by himself towards the end of the car. Stacks of bento boxes piled high on the seat across from him, beside him, and on the floor! He continued to eat and screamed, in between each chew, "TASTY!"

They all gasped and stared with raised eyebrows at the man who was Kyojuro Rengoku, the supposed Flame Hashira.

"Tasty!" He exclaimed then took another bite. "Tasty!" He exclaimed once more and took another bite. "Tasty!"

Kagami was extremely confused. More than confused! Mr. Rengoku was saying tasty with every chew and bite he enjoyed but no normal person does that. She wondered if his brain was racked loose during one of his battles, or rising to the top as a Hashira, to the point where he would mindlessly or subconsciously exclaim at his enjoyable meals. He definitely wasn't what she expected; he was tall, muscular, and handsome, for sure, but she thought he'd be stoic, emotionless, and unbothered, much like Tomioka. She should really stop comparing people to one another. Each of them had their own strengths... and personalities, obviously.

Zenitsu leaned close to Tanjiro's ear, covering his mouth with his hand, whispering, "That's the Flame Hashira?"

Tanjiro, who looked just as confused and in disbelief as the rest of them, nodded his head. "Uh huh," He nervously stammered.

"Tasty!"

"Not just some random glutton?" Zenitsu quietly huffed.

"Tasty!"

"Uh huh," Tanjiro stammered once again with a nervous smile.

Kagami tore her eyes away from the man and looked back at Tanjiro with a questionable look. "This is... one of the Hashiras who wanted both you and Nezuko executed? He doesn't seem... like the type to do that," She spoke glancing an eye towards Mr. Rengoku.

Tanjiro sighed but nodded his head again. They were meeting up with a Hashira who wanted Tanjiro killed? And they were supposed to help him? Scary! They nervously walked up to Mr. Rengoku, putting on shaky, anxious smiles, as he continued eating as if they weren't there. "Um, Mr. Rengoku?" Kagami shyly spoke up.

"Tasty!"

They glanced at one another when he didn't acknowledge her. "S-Sir?" Tanjiro spoke up instead raising a trembling hand.

They gasped and reared back, bumping into each other accidentally, when Mr. Rengoku sharply twisted to them, exclaiming, "TASTY!" in their faces.

"We heard you... the first 50 times," Tanjiro mumbled out.

As the women in uniforms who tend to the mechanical beast, keeping it clean and happy, as well as feeding the people it allows to ride in it, took away the dozen bento boxes Mr. Rengoku emptied in what looked like mere seconds, he crossed his arms and flashed an enthusiastic smile at them. He held himself high and proudly, but not in a condescending or rude manner. He was confident in himself and in his abilities. She could sense the courageous, friendly, and brave aura that surrounded him. To say she'd have mistaken the man for a weirdo was a true regret! Kagami didn't believe in love at first sight, or meeting, but he might've changed her mind!

They paid no attention to the light that flickered above them just for a few seconds, as Mr. Rengoku loudly and victoriously spoke, "It's you. You were at the mansion," to Tanjiro.

"Yes, I'm Tanjiro Kamado," Tanjiro introduced himself with a kind smile. He gestured a hand to each of them, speaking, "This is Kagami Yamato, Zenitsu Agatsuma, and Inosuke Hashibira." Kagami and Zenitsu bowed their heads respectfully as Inosuke placed his hands on his hips, billowing out proud steams from the nostrils of his mask.

"I see," Mr. Rengoku spoke nodding his head. Then, his fiery golden eyes landed on the box Tanjiro carried on his back. "Also, isn't there one in that box?"

Tanjiro nodded his head. "Right, my sister Nezuko."

Even though he still held a proud smile and a friendly demeanor, Kagami sensed he wasn't happy about Nezuko's presence. "Yes! I remember that demon," He spoke and turned his head away. "Since the Master accepted her, as well as one of my most trusted comrades, Tenshi, vouches for her, I will keep my peace."

Tanjiro sighed out, relieved, and smiled brightly.

"Oh! Speaking of Miss Tenshi," Kagami gasped out remembering her message, "She says she sends her regards."

Mr. Rengoku let out a small, warm laugh and smiled gently. Kagami's breath got hitched at the back of her throat, her heart skipping a beat, hearing such a loving laugh produced from a man like him. Even at the sound of Tenshi's name falling from her lips caused Mr. Rengoku to smile differently. Almost lovingly. His eyes sparkled when they met hers and he spoke, "Thank you for relaying her message to me."

She couldn't help but blush under his gaze and nodded her head.

He patted the seat next to him and looked at them all, speaking, "Sit down, won't you?"

Tanjiro took the seat beside him placing Nezuko's box down at their feet. Kagami took the seat across from them, whipping out her mother's book from inside her haori, as Zenitsu and Inosuke sat at the seats across the aisle from them. She wasn't envious of Zenitsu right then. Inosuke was pounding the window, still laughing and giggling like a lunatic, and Zenitsu had to be the one to pull him off and calm him down, somehow.

They all thought she'd had some sort of handle on the boar freak after their confessions but they both decided to leave it be... Not by actually talking about but by actually not doing anything about it.

"And what brings the four of you here? A mission?" Mr. Rengoku asked them without actually looking at them.

Kagami nodded her head. "Yes. We were given orders to join you. We were told that casualties on this train were rising," She explained.

"Ah! That's why you're here. Understood," Mr. Rengoku replied still not exactly looking at her.

She looked down at her mother's book and remembered the flames and fire techniques that were written inside. From what her mother understood, Dragon Breathing was a different variation of both fire and flame. Her mother was very strict the two were very different from one another but was curious as to how Dragon Breathing incorporated the two.

Her breathing technique descended from magical dragons that used to rule the lands of Ancient Japan. Her mother speculated, after researching until she couldn't any longer, that the dragons gave a clan of humans the ability to create fire and flame, wielding it to their use in order to improve and progress their technology. Known as the Doragon Clan, the clansmen revered the dragons as gods and gave them offerings for thousands of years, thanking them for their generosity. Except, over 1,000 years ago, the dragons were entirely wiped out by an unknown killer. It wrecked havoc throughout the lands but, tragically, the killer slaughtered every single person who had even a trace of the dragon's power.

Those who survived could be counted on a single hand. They did their best to hide, run, and recreate as well as reproduce the magic the dragons had given them. It was almost hopeless thinking they could reproduce a child bearing the dragon's gifts when so many were dead and the blood that ran its power began to get dimmer and dimmer. Her mother deducted the demons infected the lands after the dragons were needlessly slaughtered. It was obvious whoever killed them and slaughtered the clan wanted to make sure that nothing rivaled them.

Her mother's existence was proof the power of the dragons lived and it made her an enemy. She figured it was the reason why her family was targeted and why she would still be. After becoming pregnant, she and her husband planned on moving to the other side of the world to get away from the clutches of Muzan Kibutsuji.

Though, Kagami was born and raised in Japan still. Her father more than likely couldn't leave the land he found the love of his life in. Such... tragedy.

Perhaps Mr. Rengoku knows something on her mother, how she died, or maybe Dragon Breathing itself.

"Sir," Tanjiro suddenly spoke up first, "There's something... I wanted to ask you."

"Oh? What is it?" Mr. Rengoku spoke still not sparing him a glance.

Kagami decided to wait until Tanjiro was done asking Mr. Rengoku his questions and set her eyes tiredly on Zenitsu and Inosuke. The boar freak was still trying to bang and climb out of the window with Zenitsu having a hard time holding him back. She thought maybe it was time she stepped in. Though, seeing how much Zenitsu was struggling, she decided to stay out of it once more.

"It's about my father," Tanjiro sighed.

"What about your father?" Mr. Rengoku asked.

"He was a frail man."

"Was he, now?!"

"And yet... He could perform a kagura dance in freezing weather."

"Well, good for him!"

"And then...!"

"And then?!"

Watching the two converse exhausted Kagami as much as watching Zenitsu fighting back a restless and excited Inosuke. Her eyes whipped from the boy to the man back to the boy then back to them with their conversation getting nowhere! Mr. Rengoku replied after every single small sentence Tanjiro spoke but every sentence Tanjiro made added details that didn't drive where he needed or wanted to go. She felt like sighing and telling him to hurry up so she could ask Mr. Rengoku her questions!

Tanjiro lifted his head and stared determinedly in the air, speaking, "Hinokami Kagura, the dance... I found myself doing it, just like my father used to. I was hoping if you knew anything about that dance, you'd be willing to tell me."

Kagami remembered Tanjiro speaking of his battle against Twelve Kizuki Lower Rank 5. How his life flashed before his eyes and adopted a breathing technique his dad danced to in mere seconds. The Hinokami Kagura dance named after the fire god of the Shinto religion. It made her breathless just hearing and thinking about the fire and flame that produced from his sword. Fire burning so hot that it easily burned through the Twelve Kizuki's threads and nearly decapitated him.

Tanjiro thought the same as Kagami: To ask Mr. Rengoku, the Flame Hashira, about the different fire and flame breathing techniques.

Mr. Rengoku's smile never faltered when he sat in silence for a few moments. "Certainly!" He exclaimed much to Tanjiro's happiness. "But I don't!" He then added breaking Tanjiro's heart. "I have never even heard of that dance, not once. Your father taking this kagura and adapting it for battle is commendable. There's nothing more to say about it!"

"Well, maybe you know something on Dragon Breathing?" Kagami nervously asked raising her mother's book. "Perhaps its connected with the dance somehow."

"I do not!" Mr. Rengoku exclaimed proudly.

Kagami thought she heard her heart break in her chest. How could no one know anything on Dragon Breathing? How could its existence be wiped from the earth?!

"H-Hang on! Are you sure you can't think of-?!" Tanjiro began to frantically ask but-

"You should become my Tsugukos! I'll look after you," Mr. Rengoku loudly and proudly declared! His body radiated with such energy, power, and light it nearly blinded and overwhelmed her!

Kagami and Tanjiro immediately screamed, "Not so fast!" hearing his announcement.

She was flattered to hear Mr. Rengoku wanted the two of them to be his Tsugukos. She didn't think a Hashira could have more than one but there might be exceptions seeing how Lady Kocho had two as well, Karasuma and Kanao. He didn't seem to hesitate declaring he wanted them to be his Tsugukos. Nothing he ever said seemed to be riddled with lies, misconceptions, or what he might regret later. He knew exactly what to say and meant what he said. He was glorious!

"Flame Breathing has a long history. A Hashira of flame and of water have always existed," He began to explain to them, "Flame, Water, Wind, Stone, and Thunder, the breathing fundamentals. All other techniques branched off from those five, like how Mist is a branch of Wind. There have only been two exceptions where they fit in no known fundamentals, Angel and Shadow." He lifted his head and added, "Mizoguchi, Takahashi, what color are your swords?"

Kagami and Tanjiro glanced at each other in confusion and realized he was talking about them!

"Um, our names are Kamado and Yamato, sir," Kagami shakily reminded him. "His sword is black and mine is red."

"Black? Is it, now? How unfortunate! Hahaha!" Mr. Rengoku laughed tilting his head back hearing her answer. Tanjiro looked visibly shaken at Mr. Rengoku's laugh. "I see, Yamato has the same red color blade as I! You were meant to be my Tsuguko!"

Kagami blushed and shrugged sheepishly.

"Back it up a bit," Tanjiro gasped shaking his hands. "Why do you say it's unfortunate?"

"I've yet to see one with a black sword become a Hashira. Also, I hear they have no idea what style to master," Mr. Rengoku explained perfectly of Tanjiro's situation between choosing the Water Breathing or Hinokami Kagura breathing style. Tanjiro slowly dropped his head, a sad expression spreading across his face, when Mr. Rengoku, again, loudly declared at the top of his lungs, "There is no need for you to worry! I can train you!"

Kagami and Tanjiro quickly shook their hands again, exclaiming, "Maybe later!"

Mr. Rengoku began to rest his eyes for a moment and Kagami couldn't help but gaze into his face. He sure was handsome and seemed so majestic for someone of his build. He was so charismatic, cheerful, eccentric, and so much more. He may have been extremely loud and a bit odd, but it added a lot to his charm. She could sense how strong his moral codes are and how powerful his sense of justice is. Mr. Rengoku was genuinely a good guy.

Something sparkled in her vision.

"Mr. Rengoku, that's a pretty necklace," She spoke softly.

Kagami pointed to the beautiful silver necklace hanging around his neck that bounced lightly against his chest. The small tiny gems twinkled lightly against the reflections of the light.

He looked down at it and spoke, clearly and loudly like always, "Thank you, Young Yamato. It's a precious gift from someone I dearly care about."

"Like who?" Tanjiro curiously asked.

Mr. Rengoku didn't answer. He just continued smiling and laughed jovially.

Kagami wondered who the necklace was from and what it symbolized. It wasn't from anything she recognized but it does faintly remind her of the angelic symbols and runes that marked Tenshi's haori. It might've been a coincidence.

It must've been a secret if Mr. Rengoku didn't divulge the information freely to them. It was fine. She thought it was sweet and cute he has someone waiting for him at home when their mission is finally concluded. It wasn't surprising or shocking to hear he's promised to someone. She could only hope she'd have the chance to meet his special someone after it was all over.

For now, they've got demons to kill.