Isekai Mizuki S1 - A World With Demons

Chapter 13 - Kanao's Confession, Mysterious Kizuki Member

Monday, 8:00 A.M, Week 2, Kimetsu Academy

"Aaah, my back hurts. Didn't even sleep well," Tanjiro groaned, bending his back to make it snap. "Well, uh, what time did you sleep?" Kanao asked, concerned. "About 1 A.M. I did some training with Isekai, and he barely held back on the lessons," Tanjiro answered, trying to fix his arm from the constant bending of the swings Isekai trained him for.

"You DID agree to join the Corporation..." Isekai replied, trying to prove a point. "Yeah, I guess I had it coming." Mr. Rengoku enters the class, shining and vibrant as ever.

"Alright, everyone! It's time to begin your Science class! We're going to have a little fun. This time, we're going to do a bit of chemistry! Susamaru, Murata, Ozaki and Nezuko, can you four help me get some things from the storage room?" he announced, asking the four to come with him.

"I'm not exactly sure if this is gonna be fun, or boring," Isekai commented. "Easy for you to say! I can't even tell which element is which! I'm blind!" Yahaba yelled at Isekai, with a pint of disappointment.

"Well, we are high schoolers, we should be able to learn this stuff at our level..." Kanao told Yahaba, shrugging. Inosuke groaned, and questioned it. "Ugh, why do I even need to learn this?" "Would depend on what you want your job to be in the future, no?" Zenitsu replied, making Inosuke scoff. "Psh... I'll be the greatest fighter there ever was! That's my future..." he said with a full tub of confidence.

"Uh-huh..." Muichiro uttered with a sarcastic tone. "ARE YOU DOUBTING ME, KELP HAIR?! I'LL BEAT YOU UP MYSELF, JUST YOU WATCH!" Inosuke angrily yelled, attempting to run up to Muichiro as Zenitsu gripped his arms to stop him. "My name's Muichiro," he said with a monotonous voice. "He has a point, though. Tanjiro kicked your butt badly. You didn't even make it past the first round before losing," Sabito uttered as he gave off a point.

"And I doubt you would have lasted longer than Yahaba against Muichiro with your simple weakness," Isekai added, rubbing salt on the wound. "I can't even argue with him... he's right..."  Inosuke thought, turning away. At that moment, Mr. Rengoku walked back into the classroom.

"Alright, class! We'll begin by a few, simple experiments! Makomo, how about you come up and take these two potions, and pour one into the other?" Rengoku requested. Makomo stood up and tried to pour a vial of pink liquid into another vial of red liquid. The two combined substances made a glittery puff.

"We'll call these A and B for now. Jot that down into your notes, now!" he said as the class was writing in their notebooks. Rengoku continued. "Tanjiro, how about you come up and try to do it?" he asked. Tanjiro stood up and walked over, and poured a blue, shining liquid into a bottle of pitch black. However, the vial containing the blue liquid shattered.

Rengoku internally questioned what was happening. Tanjiro was beginning to sweat, and uttered, "M-M-Mr. Rengoku, I swear I did no-" "I know, I know! What happened just now?"

Outside the classroom, on a tree on a cloudy day...

"Good, let's see if that happens again."

In the classroom...

"Clearly whoever did this isn't in here..." he said as he flashed to look through the door window, as he felt someone was there. By the time he looked, the figure was gone. Mr. Rengoku had a red sword in his pocket. He was ready to draw it out if the time was needed.

In one instant, a force of air nearly blew open Nezuko's head. Mr. Rengoku, however, guarded her. The announcements speaker blared roughly two seconds after Nezuko was guarded. "Warning! Demon attack on the premises, demon attack on the premises! This is not a drill, I repeat, this is not a drill!" a speaker announced, prompting everyone to shut the blinds.