Yue Tanaka works at the Butterfly Estate as a helper, she's Giyuu Tomioka cousin and she's also working her way up to become a Hashira.
Shinjuro Rengoku, saved Yue when she was little after her mom became a demon, killed her father and attempted to...
***just as you guested, more Mugen Train spoilers, some scenes straight from the Manga and Movie and some I've added***
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"Are you sure you're okay Pretty girl? Do you feel sick?" Kyojuro asked as he saw the uneasiness in Yue face.
"I'm fine Kyo" she responded as she played with the bento box instead of eating it as Kyojuro ate his. He kept his eyes on Yue. He didn't know why her attitude changed, he had an idea of course. He knew her mental state has not been the best since that encounter with that demon that gave her the scar on her face that she despised so much. He had to make sure he protected her no matter what this time, he knew if it came to giving up his life.. then that is what he'll do.
Yue head slightly turned and she looked slightly surprised as she saw Tanjiro, Inosuke and Zenitsu approaching the two. The other passengers on board were getting annoyed over Kyojuro 'Umai' after every bento box he ate. This man had a lot of room to stuff down that food while Yue couldn't force herself to eat.
"Is that the Flame Hashira guy?" Zenitsu said into Tanjiro ear. Tanjiro didn't respond, he just smiled awkwardly and nodded his head as he was still shocked that one of the most powerful Hashira's was... sort of... acting like a child.
"Not just some random glutton?" Zenitsu added causing Yue to laugh slightly. Tanjiro again didn't respond and just nodded his head as he approached the Flame Hashira.
"Um.. excuse me, Rengoku-Sama" Tanjiro said as Zenitsu hid himself behind Tanjiro. Inosuke was staring out the window of the train amazed at this contraption. Kyojuro didn't pay any attention to the Demon Slayer as he yelled
"Umai!"
"R-Rengoku-Sama" Tanjiro stuttered sweat dropping from his face.
"Umai!" Kyojuro yelled turning to the younger Demon Slayers.
"Uh.. we really got that part already" Tanjiro said as Yue placed a hand on Kyojuro shoulder.
"Don't mind him, he's just excited" Yue responded smiling lightly like everything was okay when in reality her anxiety level just sky rocketed now that 3 young Demon Slayers were on the train with them with a loose Upper or Lower moon also on board.
"You're the kid from that day, Yue-San was helping you practice Total Concentration Breathing" Kyojuro said shifting so he was sitting more comfortable as he crossed his arms. Yue shifted her eyes out the window, she started to drift deep in her thoughts as she continued to worry. She knew something bad was gonna happen, she just had to wait it out. Kyojuro side eyed her watching her closely, he wanted to comfort her but he had to talk with the three teens in front of him first.
"Yes! I'm Tanjiro Kamado. These are my fellow Demon Slayers. Zenitsu Agatsuma and Inosuke Hashibria" Tanjiro said and Kyojuro nodded before his eyes traveled over to the box on the boy with the checkered Haori back.
"I see, and inside that box there is your sister?" Kyojuro asked and Tanjiro nodded his head.