Reverse's p.o.v

I keep walking to my estate to take someone who being there for awhile. Finally I reach at the gate of my own estate as I open it, a silent greeting me alonh with the silent wind

Where is everybody?

I sighs then walking to inside and open the door. My first reaction is froze on the spot because the floor and everything was cleaning without any dust

Suddenly a Kakushi named, Jinpei look shocked by a sudden appeared of Elemental hashira, or as known as me

"Reverse-sama!!" he then jump to me and crying

I was stunning between confused or surprised but I patted his back slowly as he escape a hiccups

Suddenly someone who suppose not to come out infront of me

"H-hello, R-Reverse-s-sama" Itonoshi Mitsuo, a demon I cured. How in the world he is here.....!?

"Jinpei..." I called him as my aura turned darken and made Mitsuo jolted in surprised

Jinpei still crying in my hug

"Jinpei" still he not answer it

I take inhale deeply, "JINPEI!!!!"

He, Mitsuo and probably everyone in this estate jolted in surprised of my loud voice

"R-Reverse-sama" he asked and looks confused

"Tell me, why Mitsuo is here? Did I told you not to go to basement?" I asked

Jinpei shaking in fear and used Mitsuo as his sheild

Mitsuo who seeing this standing for protect Jinpei

"It's not like that, Reverse-sama. I'm the one who go out by myself" I was surprised and asks why then he tell me everything

"What do you mean?" I asked and Mitsuo playing his fingers

"It's a long story...."

"Make it short" I said with strict as Mitsuo nodded his head quickly like a chicken pecking the ground

End Reverse's p.o.v

No one p.o.v

Flashback

Mitsuo wake up after being in basement for a week, a weird is he need not to felt hungry at all and also he not think about human flesh and blood

Because of boredom, he want to get out from the basement but it's locked

He tried to use his brain without break the door because he know it's will attract everyone attention in this estate

But suddenly he remember his own demon arts, which is shapeshifter

He can turn into any living creature he want as long he know how they are looks like. After think what kind a perfect creature he want to be, he become the ant

Luckily the time he do that is midnight and he look around the mansion until he found a kitchen

He not felt hungry at all but seeing a the saved food made him want to eat it

At the time, he really enjoy the food until he not realized....

"What the...."

.....he busted. Jinpei in his sleep clothes, look at Mitsou with shocked look while holding a latern

The made an eyes contact for awhile before Jinpei shouts

"A THEIF!!" Jinpei points to Mitsuo with his index finger

"I'M NOT A THEIF!!!" Mitsuo talked back with angry look and a food from inside his mouth scattered everywhere

After a long shouting to each other, they stopped because they get tired

Mitsuo use that change to tell to Jinpei who is he and what is he doing here

After that he told everyone a same thing like he told to Jinpei

End flashback

"And that's how it happened" said Mitsou

Reverse who heard that only nodded, "I see, you are the one who exposed yourself?"

Mitsuo nodded and think Reverse will give him a punish but he heard a heavy sighs, "I should know that I won't ended up being beated by that Uppermoon one and coma for almost one month"

"......You won't punish me?" Mitsuo asked

"Why would I?" Reverse raised his eyebrow in questionable

Mitsuo shaking his head, "Nothing" but inside he is happy not get punish

"Well beside of punish I have something for you"

Mitsou look at him, "What is it?" he asked only to see Reverse smirked

At night time, a beautiful night city with crowded people come with their family for the beauty and almost modern city

Aside of crowded place, there a man in about 20-an, tapping his foot in frustration because he was waiting for someone

'Where is that guy?! He already made a promise to Tamayo-sama!! He better to not be late!' thought him, a person known as Yushiro one of loyal person to Tamayo

"Sorry for being late"

After a long time Yushiro look at a person that made a promise

"Finally, talking about a time. What made you so late, huh? You know how much time you wasted?!" Yushiro asked and his face look angry toward Reverse

"I know but I was try to bring him with me" then he pointed a guy behind him use his thumb

"Who is that?" Yushiro asked and Reverse only smirk

"You will know once I meet with Tamayo-san first"

Yushiro look pissed when see this boy with cheeky looks say Tamayo-sama's name

Yushiro take an inhale and gesture them to their new hideout

"Hello,  there. It's nice to meet you again, Reverse" greeting Tamayo. She now sitting on the chair while looking on something

"I appreciated it" said Reverse

"I see you brought someone here as well. May I know who is he?" Tamayo asked, she look raised her guarda bit because of a new person Reverse bring with

"This is Mitsuo, he is the first demon I cured" as Reverse said that, Tamayo was shocked

"Is he a demon you cured with your own experiment?" she asked and Reverse nodded

"I see, your cure is worked and you only need a week to made it" said Tamayo and Reverse nodded, without they know Yushiro looking jealous toward Reverse

"Yushiro, could you bring Mitsou-san with you. I want talk privately to Reverse" said Tamayo

"Of course, Tamayo-sama" obeyed Yushiro as he walk toward the door with Mitsuo follow him

Before Yushiro touch to knob door, he say something to Mitsuo as that demon nodded and open the door first

Yushiro come closer to Reverse, really close to his ear, "Listen here, I hope you not hurt Tamayo-sama or else I will kill you"

His whispered to him, so Tamayo won't hear it

Reverse still keep his face, "I will keep that promise"

Yushiro scoffed and left them alone

"Anyways, what do you want from me?" he asked pretent like nothing happened

"I need your help, your cure really dangerous but a key for us to defeat Muzan. I had made an analysis about this and I realized there something similarity about your cure and Nezuko's blood" said her

"You have her sample blood?" Reverse asked surprised

"Yes, her brother and friend allow me to study her blood. You seems know them"

"Yes, I know them awhile ago" as he said that Tamayo nodded

"Can I know what is the similarity between my cure and her blood?"

Tamayo nodded once again, she gestured to her microscope, where she is now studying Nezuko's blood again

Reverse take a look at sample, his eyes widen perfectly even behind the mask

"This blue particles....."

"Yes, what you seeing right now those blue praticles are can be found in your own cure as well. Seems like you know what is it, right?" she asked

Reverse silent for a while and get away from the microscope

"I'm. Did you know Blue Spider lily?" he asked, then he turn his body to meet Tamayo's eyes widen a bit but she nodded

"I used it in my own cure" Tamayo putted her hand at her mouth, probably not ready to know it

"I don't expect this. Muzan will do anything to find that flower to get immortality. Reverse, you must..."

"I know. Don't worry, the flower is under my care and only I know where is it" said Reverse as Tamayo sighs

"I see. However, when you said those blue praticles is blue spider lily, how it can be Nezuko have that?" Tamayo look at the blood sample again

"Probably she already have it before she turned into demon" said Reverse standing beside Tamayo

Tamayo stunned, "You mean when she still a human?" she asked and look at Reverse

The said person nodded, "I believe she will immune to sun but I still not sure when, the blue spider lily in her body is less than mine"

"Before I forgot I want to ask, what is other material you made for the cure?" Tamayo asked and made Reverse off guard

"This......hard to believe........but promise to me you will not tell to anyone else, except for Yushiro"

Tamayo nodded, Reverse take inhale and left it out roughly

"The other material I used is my blood"

Tamayo look shocked

"I know it's unbelievable but I already did it. First, my blood as been known as Marechi but time by time, I discovered that my blood is very special. My blood can make any demon sick, crazy and unable to use their blood demon art perfectly, but I not sure if it's Uppermoon. I was curious what will happen I use my blood for something and then someone give me an idea to create a cure and I did"

"...... I see" said Tamayo, "But are you okay with this? You will loss some of your blood of you if keep doing this" said her

Reverse nodded, "I know, but there something weird, whenever I loss a blood I just felt tired but I never fainted or stay at wad more than 3 weeks except that"

Tamayo nodded again, Reverse sighs and look at outside, where he spotted Kagaya's crow, Shūryo

The crow fly away, in his way to give a report to Kagaya

Reverse seeing this probably will be question by Kagaya but he only let it be

"I guess it being late" said him as he look at outside, it's already night and he not have his sword, great

"Yeah, how about you stay here?" she suggested him, but Reverse declined it

"No need, I can rent a room near here" said him as he go toward door and open it

"Tamayo-sama!!" Yushiro suddenly come inside and run pass Reverse to meet Tamayo to make sure she is alright

"Are you hurt? Did that slayer did something to you?" he asked to her, while holding her both hands

Tamayo looks shocked then she made out a small smile to Yushiro

"No it's okey, Yushiro. You not need to worry about it" said her with flowers background that made her look more beautiful, surely this is Yushiro's delusional

"Ta-Tamayo-sama......"

Reverse who seeing it only give a deadpanned look, 'Seeing this felt like I looking at Mitsuri and Obanai's lovey dovey conversation'

Then Mitsuo enter only to see this, stunned

He about to open his mouth and ask Reverse but the said person speak first

"Don't ask question" then Mitsuo shut his mouth and look at his forward again

Taisho secret era:

Mitsuo is actually 15 year old, but in his demon form he looks like 30-an. He was a polite boy and obey to Reverse and someone nice to him. Really hate Muzan and don't have good-relationship with Yushiro. His favourite food is miso soup