All Pillars had spent their entire week training this 'Ripple' technique from him. After they had learned it they started to know how amazing this technique was. Even though it hurt, it was worth it when they knew that they could become stronger to slay a demon.

"So there are a lot of people who have different hair colors in the outside world?

" Mitsuri asked.

Mitsuri Kanroji is a Demon Hunter and the Love Pillar of the Demon Killing Corps. She has light green eyes, light skin, and pink hair that fades into a neon green color towards the ends. She also has a rather large b.r.e.a.s.t and keeps the b.r.e.a.s.t area of her uniform unbuttoned to accommodate her chest size.

Mitsuri was born with unnatural strength and a strange hair color. She was seen as a freak and was rejected from being married because of these attributes. She then encountered Kagaya Ubuyashiki who told her to reject normalcy and embrace who she was. Because of this encounter, she joined the Demon Hunters and used her skill and ridiculous strength to rise to the status of Pillar. She also adopted an idea that she would find a man stronger than her to marry.

That is why she started to put her target on him.

Haru didn't know what she was thinking,

"Yes, my hair is also grey, Gin-san is grey, and that octopus is more freak than you.

"

"...

" Korosensei was silent when he heard him bluntly mocked him. He drank his tea calmly yet he was thinking about his revenge later.

Mitsuri looked at Korosensei with a pitiful expression. She thought that she had a lot of hardship but there was someone who was more pitiful than her. She walked toward him and patted his shoulder,

"Don't mind.

"

"...

" Korosensei looked at him and said,

"Haru-kun, I might try to leak that video to the internet later.

"

"...

" Haru squinted his eyes and said,

"Sensei, I might as well share your p.o.r.n magazine with the world and let them know what your fetish is.

" He suddenly pulled Mitsuri away from him,

"Everyone might not notice it but your eyes have been glancing at her b.r.e.a.s.ts every 0.2 seconds.

"

Mitsuri hurriedly closed her b.r.e.a.s.ts when she heard it.

Korosensei blushed,

"No! I've never done that!

"

"Then what is that nosebleed!?

" Haru pointed at his nose.

Korosensei hurriedly wiped his nosebleed with his tentacle,

"Now, where is the evidence?

"

"....

"

Haru was speechless when they saw that there was still a trace of blood on his nose. He took his phone and took his photo,

"Beware perverted octopus!

"

"Bastard!

" Korosensei was annoyed.

Both of them started to have a fight and pushed Gintoki who was happily eating his sweets.

Gintoki saw that his sweets were dropped on the ground and couldn't help but be shocked. He looked at both of them with an angry expression and shouted,

"What is the color of your blood?!

"

The three of them started to fight each other and caused a lot of ruckuses everywhere.

Everyone who saw this couldn't help but sweatdrop.

"They're really nice friends,

" Mitsuri smiled.

"....

"

'Really?' They thought inwardly.

"Stop it!

" Shinobu came between three of them and knocked them away.

Kagaya chuckled when he saw three of them since they were really fun.

Haru caressed his head and was done with his training. He didn't need to worry about them anymore since he had taught them the basics of the 'Ripple' technique.

They were very talented in learning of 'Ripple' since all of them were masters of 'Breathing Style'.

Haru had gotten his reward and that was every instruction of the 'Breath Style', 10 kg of Scarlet Crimson Iron Sand, and 10 kg of Scarlet Crimson Ore. He wasn't sure where he could get this Blue Spider Lily since it was very rare.

He didn't touch the 'Breath Style' since it was swordsmanship and he had enough power already. He didn't want to make it complicated since he still hadn't mastered most of them. He looked at Korosensei and Gintoki,

"Let's hunt a demon.

"

Both of them looked at each other and nodded. They didn't do anything besides teach the 'Ripple' to the Pillars of the Demon Slayer Corps.

"Alright, but where should we go?

" Gintoki asked.

"Do you want to hunt a demon?

" Shinobu asked.

"Yes,

" they answered.

"Then go to Natagumo Mountain,

" Shinobu said.

Haru suddenly remembered that mountain since it was one of the most exciting arcs of the story in 'Kimetsu no Yaiba'. He remembered there was a demon spider that was living in that mountain.

Shinobu started to explain to them what Natagumo Mountain was.

Natagumo Mountain is a mountain where the majority of it is covered with thick trees. The entire place has plenty of spider webs scattered around. The mountain serves as a home to the Spider Family.

"S - Spider?

" Gintoki shuddered when he thought about it. He had some bad memories of the spider and it creeped him out to touch it.

"...

" They were speechless when they saw his reaction.

"We're going to get there,

" Haru said. He knew that there would be a lot of demons in that mountain. He hoped that he could find boss of the demon since when he killed that demon that meant that he would kill the entire demon too.

It would be similar to a domino, once he had killed Muzan Kibutsuji then everything would be over and this country would be in peace.

Haru looked at Kagaya who had rotten skin that was speading his forehead. He wasn't sure whether he could heal him since it was a disease or it might be cursed. He wasn't sure and he didn't want to give him false hope. He suddenly remembered the girl who had serious diseases on her pancreas.

"So you're going to that mountain?

" Kagaya asked.

"Yes, we will go now,

" Haru said.

"Then you should bring Shinobu too,

" Kagaya said.

"...

" Shinobu was a bit speechless and nodded,

"Then, please let me follow you.

"

"Ha? I don't hear what you say, can you repeat it again?

" Haru asked.

"....

"

Veins appeared on her forehead,

"Please let me follow you....

" She really tried hard to hold her anger now.

Haru nodded and patted her shoulder,

"Don't worry, you will be safe with us around.

"

"...

" Shinobu couldn't handle it anymore and took out her sword and wanted to stab him.