Shinobu returned to the Butterfly Mansion after the meeting and was praying for Kanae. 

Shinobu: Sister, please, let me be calm. 

Kanao: OH! MASTER! Welcome home! I'm going to train with the Wind Hashira now. Do you think I can train with you after the Stone Hashira? 

Shinobu: I'm sorry Kanao, but I can't. I can't participate in the training session. 

Kanao: Why? 

Shinobu: Sit with me. 

Kanao went up to Shinobu. 

Shinobu: (blushing) I just want to train with you. Uh ... 

She blushed. 

Kanao: (Y/N) and the others are going to be involved in the training, and I thought ... you know- 

Shinobu: Kanao, you've really come around lately. Being honest with your feelings is a great sign. I think it's time I tell you about the demon who killed Kanae. 

With Tamayo... 

???: AHO! 

A crow appeared. 

Crow: Good evening Lady Tamayo. I am a messenger of Kagaya Ubuyashiki! 

Tamayo: How did you find this place? 

Crow: Connections. I looked up the old owner of this house that you bought. Then I watched over Yushiro. I may have had special training, but I'm just a crow. I don't plan on causing harm. The thing is, I want you to help us. We need your help on defeating Muzan. Please, come to the Ubuyashiki Mansion. 

Soon... 

You, Tanjiro, and the girls were training with the Hashira! 

First with Uzui! 

Uzui: Well look who showed up! 

Ruby: MR. UZUI! 

Ruby hugged him. 

(Y/N): Sup God of Festivals? 

Uzui: You beat another Upper Moon right? That's great. Now time to whip you lowlies into shape! 

Tanjiro: THANK YOU SO MUCH MR. UZUI! 

(Y/N): How are the girls? 

Makio: Hey, look who it is! 

Suma: HI! 

Hinatsuru: Welcome! 

Uzui's three wives were nearby cooking up food. 

Uzui: My girls will be handling the recovery after all you have endured this training! Now get ready! 

Everyone: YES SIR! 

At Muichiro's Place... 

Muichiro: (Y/N)! Tanjiro! Hello! 

(Y/N): Muichiro? 

Tanjiro: He seems ... livelier. 

Ruby: I remember him being ... more strange than anything. 

Muichiro: Now then, come at me with everything you have! 

Yang: I like this kid already! 

At Mitsuri's Residence... 

Mitsuri: HELLO EVEYRONE! 

Mitsuri gave everyone a big hug and you a massive kiss! 

(Y/N): (blushing) H-Hi Mitsuri! 

Blake: She's still a big sweetheart. 

Tanjiro: Thank you so much for having us here, Ms. Kanroji! 

Mitsuri: Oh, and I also made some pancakes too! 

(Y/N): AWESOME! 

Mitsuri's training was ... strange... 

She was stretching everyone while dressed up in leotards. 

With Obanai... 

Tanjiro: Hello Mr. Iguro! 

Ruby: It's nice to- 

Obanai: (Y/N) (L/N)! 

He went up to you. 

(Y/N): What? 

Obanai: So, you and Kanroji are dating, is that correct? 

(Y/N): Yes? 

Obanai: YOU BREAK HER HEART! AND I WILL BREAK YOUR BONES! 

(Y/N): WHOA! Easy! 

Obanai: Just so you know, I'm not all sunshine and rainbows like her. 

Weiss: This is getting personal. 

Suddenly you all found a bunch of Demon Slayer Corps Members tied up. 

Blake: What kind of training is this? 

Obanai: You must fight me while avoiding hitting everyone here. 

(Y/N): This is needlessly cruel. 

Obanai: It's necessary for developing your skills. 

A few minutes later... 

The girls and Tanjiro were tired, while you had given Obanai a black eye. 

(Y/N): So, I think we're good. 

Obanai: I still stand by what I said. DON'T EVER BREAK KANROJI'S HEART! 

(Y/N): You really like her, don't you? 

Much later... 

You all were going straight for- 

(Y/N): Sanemi? Oh gre- 

Zenitsu: HEEEEEEEEEEEEEEEEEEEELP! GUYS HELP ME! 

Everyone: ZENITSU?! 

Zenitsu: THAT MAN IS A MANIAC! GET HIM AWAY FROM- 

Sanemi appeared and grabbed Zenitsu by the head. 

Sanemi: GET BACK HERE AGATSUMATA! 

Zenitsu: AAAAAAAAAAAAAAAAAAAAAAIIIIIIIIIIIIIIIIIIIEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE! 

He hid behind you. 

Tanjiro: Hello Mr. Shinazugawa! 

(Y/N): Do you think you could train us? 

Sanemi: Let's go. I don't like any of you. 

Tanjiro: Well, we don't like you either! 

Ruby: Yeah! After what you put both Tanjiro and Nezuko through, we still think you're a jerk! 

Sanemi: (pissed) You punks have guts. 

Sanemi's Training was much more intense... 

Yang: Hey, at least Obanai didn't hate us. 

The bastard was especially harsh towards you. 

And then one break later... 

Genya: Bro! 

Genya approached him. 

Sanemi: When are you going to quit being a Demon Slayer already? You don't have the skills for it. Those who can't use Breathing techniques don't belong here. 

(Y/N): Genya. 

Tanjiro: Come on Genya, go for it! 

Genya: Bro! I want to apologize for you! 

Sanemi: For what? 

Genya: I ... I ate demons so I could fight. 

Sanemi: SAY WHAT?! YOU ATE DEMONS?! 

He tried to hit Sanemi, but- 

(Y/N): OH HELL NO! 

You punched him in the face! 

(Y/N): WHAT'S WRONG WITH YOU DUDE?! ARE YOU TRYING TO KILL HIM?! 

Sanemi: WHAT?! NO! I'm going to make sure he doesn't regenerate so he can quit! 

(Y/N): WHAT?! 

Tanjiro: You don't have to go that far! It doesn't matter if he doesn't have a choice! He's risking his life to fight the demons! If he wasn't around, we wouldn't have defeated the Upper Moon! 

(Y/N): Genya is our friend, and if you want to hurt him, I'll kick your ass! 

Sanemi: If that's how you want it- 

(Y/N): BRING IT ON! 

You both charged at each other as Tanjiro knew it was going to be brutal for Sanemi. 

Genya: BRO STOP! (Y/N) HAS NOTHING TO DO WITH TH- 

A few minutes later... 

Sanemi was not responding. 

You smashed all of his teeth out, broke his nose, blinded him, broke his ribs, and cut off his legs. 

Genya: BRRRRRRRRRRRROOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO! 

(Y/N): Dude calm down. 

You healed him up. And then- 

(Y/N): MIMIC: HEAVEN'S DOOR! 

You wrote down onto Sanemi, "I will respect (Y/N) (L/N) from now on and treat all of his friends with respect." 

(Y/N): There, he should be good when he wakes up. 

Genya: HE BETTER NOT BE- 

(Y/N): It's okay. He's fine. 

You hugged Genya and pat him on the back. 

(Y/N): See you around, buddy! 

Much later... 

Gyomei: Ease your mind. Even fires will become cold. 

Gyomei had everyone pushing rocks, carrying logs on their shoulders, and after training under a waterfall too! 

His training was pretty much the most intense! 

At the Infinity Fortress... 

Nakime: My Lord. 

Nakime played her biwa while a giant eye came from under her hark. 

Nakime: I found about 60 percent of the Demon Slayers and where they are. But I have no idea about the girl who conquered the sun. 

Muzan: Well done Nakime. You've become very useful in the time you've served me. 

Nakime: I am not worthy My Lord. 

Muzan smiled sadistically. 

Muzan: Nezuko, Ubuyashiki, both of you are in the palms of my hands. 

Back with you... 

Gyomei: (L/N). 

(Y/N): Huh? Gyomei? 

Gyomei: You are a pure-hearted boy. No matter what people say about you, I accept you deep in my heart, just like with your friends as well. 

(Y/N): You can tell that? I've made mistakes in the past, and I- 

Gyomei: I said you were pure-hearted, not perfect. I know that. BackthenI raised children who had no family in a temple. I gave them everything they could want. But then one child disobeyed the temple rules and didn't come back after the sun had set. Then he ran into a demon. He told the demon to eat me and the eight other children in the temple to save his own life. 

(Y/N): WHAT?! 

Gyomei: In that area, I always burned wisteria incense to keep the demons away. That child put out the wisteria incense and invited the demon inside. Four of the children were slaughtered. I tried my best to protect the others, but three of them didn't listen. Back then I was not as powerful as I am now. And I blind as well. The only one who listened to me was the youngest. She was the only one who hid behind me. The others ran. And they had their throats ripped out. I fought because I thought I had to protect Sayo at all costs. Punching a living being felt like hell for me. I felt so disgusted that I will never forget it for the rest of my life. I punched the demon's head in again and again until the sun rose. I saved Sayo. THen when people came to help- 

He was believed to be the one who had killed them all. 

(Y/N): G-Gyomei. 

Gyomei: It was a terrifying situation, so she was probably confused. She was only four at that time. Nothing can e done. But in any case, I at least wanted Sayo to be thankful because I protected her. I wanted her to say thank you on my behalf. If she said that one thing, I would have been saved, but children have their hands full with thinking of themselves. The demon's corpse turned into dust and vanished, so only the children's bones remained. I was imprisoned and charged as a murderer. If the Maser had no intervened, I would not be here now. I have come to harbor deep doubts and suspicious. And I doubted Tanjiro Kamado as well. But he never ran away. And he stayed. You kept believing in others. You never gave up on him either. Children like you two are special. From now on, I promise, I will dedicate my life to helping you. 

(Y/N): (weeping) You're ... too kind. 

He pat you on the head. 

(Y/N): (smiling) He's such a ... gentle ... giant. 

That night... 

As Kagaya lied in his bed, he heard a voice. 

Kagaya: Muzan. 

Muzan: You look horrible, don't you Ubuyashiki?