Serena's POV:
"Why don't you became a demon, Serena & join me too" Muzan said as I was scared of him. "Give me a good reason on, why you want me to became a demon..." I said as I point my sword at him still. I was on my guard up.

"You can live longer & get more powerful. Even, you can get what you wanted for long time, Serena. Something you lost or care for.." Muzan said as my eyes widen in shock of him. He smirked at my reaction as I looked down on the floor. "Just became a demon, Serena so you can get what you wanted" Muzan said as I was quiet until I looked back at him in anger.

"I will never became a demon, Muzan! Even, I'll never hurt the innocent people too!" I said as Muzan was shocked but soon turned to anger. "You are a fool, Serena..." Muzan said as I was about to attack until I heard something ticking noise until I looked, where it came from and it was... A bomb?!!

"Oh god!!!" I said as I quickly jumped out of Kagaya's house until the bomb exploded. This destroy Kagaya's home even, Muzan was still in there too. "Serena! Are you okay?! What happen here?!! Even, where's Master Kagaya too?!!" Giyu asked in a worried tone as he & Tanjiro came to check on me.

"I'm fine but, I have a question... WHY IS THERE A BOMB IN KAGAYA'S HOME?!!!" I asked as I was freaking out of this. "Wait! What?!!" Tanjiro asked as he was shocked of this. Then I saw everyone came as they were shock of, Kagaya's home was destroy. I was about to tell the others until I saw... Muzan is still alive even, he is slowly regenerating too.

"That's Muzan!" Giyu said as I was horrified until I saw Tamayo attack him with her demon blood art and she punch him in his stomach. I saw Tamayo's hand get absorb by Muzan. "Miss Tamayo!!!" I said as I run towards them. Yushiro came & he saw she was getting absorb by him. Me & the others were about to attack him until doors came out of nowhere as we all of us fall in too.

"You seriously thought you could corner me? You're all going to hell now!! You pathetic demon hunter pests. I'm slaughtering you all tonight!" Muzan said as we all fall through the door even, we were separated too. I looked around of my surrounding until I saw this place so big as I was shocked.

"What the-?! What is this place?!! Even, where's everyone too?!!" I asked myself as I was still looking around until I saw Yushiro and, I called him too. "Yushiro! Yushiro! Over here!!!" I said as he saw me and he quickly came to me too.

"Yushiro! I'm so glad your okay. Also, where are we???" I asked him as he was looking at this place. "Serena. This is the infinity fortress, where the Upper Moons are. Even, this is the place, where he stays hidden too" Yushiro said as I nodded at him until I realised, the others maybe in trouble.

"Yushiro! I need you to go & find the Upper Moon 4! Even, her name is Nakime too! I think, she's the one control this place! If you found her, you maybe can use your demon blood art to control her or something" I said as Yushiro nodded until he realised and started to talk. "Wait! What about Miss Tamayo?!" Yushiro asked in a worried tone as I turn to him.

"Don't worry, Yushiro. I'm going to save her for you. Also, stick to the plan too" I said as Yushiro eyes widen until he looks down to the floor. "Serena... you don't have to do this! This will heart break them! I saw them fall in love with you! What if, I can't do it or something?!" Yushiro said as he was trying to hold back his tears until he saw my smile.

"You can do it, Yushiro. Even, I believe in you. Do this for Tamayo too" I said as Yushiro finally nodded at me again. "When I call your name, Yushiro. That's when you take her to safety. So, be careful" I said as I went to find Tamayo.