Animeverse Slayer!

"Turn demons back into humans?"

Leo repeated those words to confirm. Shinobu nodded excitedly.

"Yes. She has already come up with a theory, now all we need are some samples to put that theory to test."

Leo took a deep breath and calmed his beating heart, he looked at Tamayo and said solemnly.

"Lady Tamayo, your research has far reaching consequences than you imagine, I need to report this to the headquarters."

His words didn't ease Tamayo rather she looked worried. Leo understood her concerns and vowed.

"Don't worry, Lady Tamayo. I will make sure no Slayer comes after you or Yushiro."

"Then I must thank you."

Leo shook his head and replied.

"No. It is we who must thank you, if this succeeds that scourge Muzan will no longer have his trump card."

...

Leo and Shinobu immediately returned to the Demon Slayer headquarters and reported everything.

"You let a demon go?"

Shinozugawa with his face full of scars stared at Leo and questioned in an angry tone.

"Shinozugawa-san, that demon was different."

"A demon is a demon. No matter how innocent they may seem, at the end all they crave for is blood and flesh of us humans."

Leo shook his head and replied.

"I know you hate demons, so do I. But, don't let that cloud your judgement. If we kill without restraint then what difference do we have from demons."

"Difference? Oh that's simple, I won't kill my friends and family but a demon will!!"

"Lady Tamayo is different. She became a demon three hundred years ago, apart from accidentally killing her family due to her insanity when transforming she has never taken another soul."

Shinozugawa scoffed.

"She killed her own family, that just shows you what a demon is."

"And she has been living her life in despair for over three hundred years, all for the sake of revenge so we can trust her."

"Ha! Like hell I would trust a demon!"

Thump!!

Gyomei clapped his palms, a loud thump echoed through the courtyard putting an end to their argument.

"Compose yourself, you are in the presence of Oyakata-sama."

Leo and Shinozugawa stared at each other and went silent. Gyomei clasped his palms infront of his c.h.e.s.t and said.

"Leo, you shouldn't trust a demon."

Leo raised his head and looked at Gyomei.

"I didn't trust a demon, Gyomei-san. I trusted a pitiful woman named Tamayo who has lost everything much like everyone here."

Gyomei couldn't refute those words. Silence fell over the courtyard, nobody wanted to speak. Seeing their confusion and hesitation Oyakata-sama spoke up.

"Tamayo... her existence was already known to us. She is a pitiful woman, her enemy was always before her but she couldn't even touch him. I know that all of you don't want to trust a demon and I won't ask you to, however you can trust in her vengeance."

All Hashiras bowed in acceptance. Leo heaved a sigh and waited for further instructions.

"As of right now she is high priority, no matter what we can't lose her. If she succeeds, our greatest disadvantage against Muzan will seize to exist."

Everyone nodded. What made Muzan a fearsome opponent wasn't just his strength but also his ability to create demons unconditionally. If Tamayo's work succeeds this advantage will become useless.

"Alright, that's enough for now."

"We pray for your good health, Oyakata-sama."

Everyone bowed and the meeting was dispersed. Shinobu was waiting for him outside.

"How did it go?"

"For now all's good. What about you, any info on Yoriichi Tsugikuni?"

"Hmm...

Shinobu nodded and said in detail what she found.

Yoriichi Tsugikuni was a Sun Breath user. He was born with red marking on his face and was considered a demon. His father wanted to abandon him, if not for his mother's threat of killing herself he would have landed on the streets or ended up dead.

His mother sent him to a temple so that he could lead a peaceful life. Years later he joined the Corps and taught them his Breathing Technique. It was from his Breathing Technique that several other techniques were developed.

Later on his life he encountered Muzan and nearly killed him. It was also in that battle Tamayo was freed. When he returned to the Corps he was burdened with the sin of letting Muzan and another demon escape. Not only that his brother also became a demon.

With such crimes on his name he left the Corps and wandered the lands never to be seen again.

Leo let out a sigh.

"He truly was something. Anyway what's your plan?"

"I am gonna wait for my sister to return, if I have her help then the research will be even faster."

Kanae was out on a mission by the time they came back, so she missed the meeting.

"Alright."

Leo and Shinobu walked back to the flower manor. Walking into the premises he saw Giyu dozing off next to a tree, Makomo was using black ink to draw something on his face.

Hearing footsteps she turned around and saw Leo and Shinobu. Nodding to them she continued her work.

Oi, atleast try to act like you were caught doing something wrong.

Leo let out a hollow laugh and decided to ignore what he just saw. He walked to the backyard and his face before sitting down.

Shinobu came out with a plate of rice balls and some water.

"Thanks."

Grabbing one Leo took a big bite and ate heartily. Shinobu sat down beside him and started to eat as well.

"Everything is going smoothly."

"Um. It won't be long before we defeat the demons."

"Yeah...

Shinobu's voice trailed off. She looked into the sky and couldn't help but whisper.

"Finally... there is hope."

Leo didn't respond and continued to eat. Shinobu took back her sight and looked at Leo wolfing down on rice balls. A warm smile crept onto her face.

Kanae quietly watched them from afar. She smiled sweetly when she saw this sight.

Looks like she made progress.