Male OC X Kimetsu No Yaiba / Demon Slayer

Pillar Training Arc Part 1

Oreki's POV

From today onwards, we're going to prepare ourselves before fighting Muzan and other Upper Moons. Katsuki and I offered to help them train, to which Oyakata-Sama agrees. They give me a certain spot in the forest and I use the Wood release to create a small traditional building for part of my training.

There's almost no Demon Slayer that comes at this checkpoint. Maybe they were already told that Katsuki is a Demon. Did they know Katsuki is Upper Two's little brother? If so, then there's no wonder there are no other people here.

"Yoru-San! We're here!" Tanjiro comes into view.

"Hey, emo! They said that you're strong! Fight me! FIGHT ME!" Inosuke said with his boar head-on. Hey, I'm not emo. Who do you think I am?

"You idiot! Do you want to dieeeeeee?!!" Zenitsu with his usual screeching.

Ah, I've finally been able to greet the trio more properly. "What do we have here? The Kamaboko squad is asking to fight me?"

Tanjiro paused at the mention of the name. "My name is Tanjiro Kamado!" He sure is serious at the naming part.

"Yeah, I know all of your names already." My face is blank as I stated that fact. "So, you guys passed the other Pillars' training? Impressive. Now, let's begin our class. Sit down on the wooden floor." Yeah, I can make wooden chairs but we're not here for a tea party so why bother?

"Hold on!" Tanjiro raises his hand. "Aren't we going to practice using our sword?!"

"That would be a practical class, which we will do later~" Katsuki interrupts. He is sitting under a shady tree. Sunlight may not be a harm to him, but he said the sun is still hot. Maybe he doesn't want to get sunburn?

With that said, they obediently sit. "Okay, so basically, this class will only teach one subject. The way to kill. I call this, Assassination Classroom." Not gonna lie, but I'm a fan of your works, Yusei Matsui.

"That's a flashy name! I liked it! I, the great Inosuke Hashibara am now part of Assassination Classroom!" Oh gosh, when Inosuke said it that way, I can't help but imagine a crossover of Demon Slayer and Assassination Classroom.

"What's the point of this class? Not to be rude, I mean, don't we all know how to kill a demon?" Zenitsu squeakily asks a question.

"Oh yeah? You know how to kill Muzan and the Upper Moons?" My question is answered by him shaking his head. "No, you don't. That's why I made this class. But first, let me tell you something. Tanjiro Kamado!"

"Y-Yes?!"

"Fighting fair and square is bullshit! Don't announce your arrival when you stumble upon a demon!"

"R-Right! I will be sure to remember that!"

"Zenitsu Agatsuma!"

"Y-y-yes?"

"It's okay for you to sleep when facing the enemy! Only you! This advice is useless to others!"

"EEEEEEEEEEEEHHHHH?!!"

"Me! The great Inosuke Hashibara's turn has come! What do you have to say to me?!"

"Katsuki has a few words for you."

"I feel kinda guilty to keep this from you so I'll tell you right now." Katsuki looks at the trio with an unflattering smile. "Unfortunately, my nii-san is the one who killed your mother. Don't keep any sour feelings m'kay?~"

"WHAT?!!" The rest of us are shocked by this reveal. " I have a mother? But I was raised by the boars!"

"So a boar gave birth to you? You're a human, so does your parents. Your face is just like her. But her face is softer and kinder. So, don't feel offended when someone is shocked to see your face. They are just stunned because you have a beautiful face." Katsuki tells the truth like it's the easiest thing in the world. Damn, that's a heavy spoiler. "I wasn't around that time. Buuuuuut, you're alive!~ She managed to save you after all."