Serena's POV:
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"WHAT?!! You can't be serious! I can't be your eldest sister! I have a little brother and, I have parents too!" I said as I was trying to break free from the threads.

"I'm not letting anyone ruin this family even I have to kill anyone, who gets in my way" Rui said as I was really terrified of him. "My friends will stop you, Rui! They will do anything to stop you from doing something bad!" I said to him as Rui started to chuckle at me.

"I like to see them try and kill one of the Twelve Kizuki" Rui said as he removed his hair to reveal a number in his left eye.

"T-The Twelve Kizuki..?" I asked in confusion as I don't know, what is the Twelve Kizuki. "You never heard of them... I'm one of Twelve Kizuki and, I'm one of the strong ones too" Rui said as I got really scared now. I don't want Tanjiro counter to him, he's going to get hurt too.

"RUI! RUI!" I heard someone as I look down towards the person because I was tied up by the threads still. I saw a girl looked like, Rui.

"Is... that your sister..?" I asked as I was hoping she can distract him so can escape. "Yes. That's my oldest sister, Kumo Oni. You stay here, Serena. I'll be back for you" Rui said as he went to Kumo Oni.

"I need to hurry and escape from here! Even, I need to warn Tanjiro and the others too!" I said to myself as I was starting to struggle to break free. Then I heard Rui's sister screamed in pain, I saw Rui hurting her.

"I'm sorry, Rui! Please stop!" Kumo Oni said as she was crying. "What I said to you? I hate it, when you change your face" Rui said as I was terrified, what he did to her. Then I heard someone nearby and, it was Tanjiro too?!! I don't know, what Rui & Tanjiro were saying but, I had enough strength to get his attention as I call him.

"Tanjiro!!!" I called to him as he heard me. When he looks up, Tanjiro's expression was showing terrified as he saw I was tied up by Rui's threads. He looked back at Rui as he started to glare at him really angry.

"What are you doing to Serena?!" Tanjiro asked as he was getting ready to fight him. "Oh? You must be one of her friends. She's going to become my new elder sister, she's perfect for my family" Rui said as Tanjiro was shocked to hear this from him.

"I'm not letting you take her! Serena is not a object! She's a human being, just like me and the other demon slayers, who you killed!" Tanjiro said as I was scared for his safety. He's going to die by him!

"Tanjiro!!! He's one of the Twelve Kizuki!!! Don't die!!!" I said to him as Tanjiro was dodging Rui's threads. Then Tanjiro was prepared to get killed until Nezuko risk her life to save her brother, Rui was shocked to see this as I started to fear for Nezuko life until Rui got her as Nezuko was tied up like me.

"Everyone is going to die! I don't want this for everyone!" I said to myself as I feel the Moon symbol on my forehead.

"Leave my friends alone, Rui!!!" I said as I pulled out my nichirin sword even, I broke free from Rui's threads. "Breath of the Moon, First Form: Moon Crystal Slash!" I said as I slice Rui's head off even, I fallen onto the ground is so hard too.

"H-How... how did you do it, Serena... I never seen that breathing technique before..." Rui asked as I looked at him. Tears start to form in my eyes as I feel so sorry for him, he just wants a family but... at least he's going to see his parents again.

"I'm so sorry, Rui... I'm so sorry, I had to do this to you. I thought there was hope, I can help you" I said as I place my hand on his head even, I was still crying too. I saw his eyes widen even, tears started to form in his eyes too.

"Your... the Neo Queen Serenity... I heard stories about you, when I was little... I always wanted to see what you look like in person... even, you use moon breathing technique too" Rui said as I gave him a kind smile. "You've got your dream come true, Rui. You finally see me in person. Your parents are waiting for you" I said to him. My tears fall from my eyes so fast as Rui was slowly disappearing from my hand.

"S-Serena... be careful... Muzan Kibutsuji will be coming after you. Even, you're not the only one, who is using moon breathing technique... Watch out for Upper Moon 1..." Rui said as he turned into ashes. Then I saw Nezuko was next to me so I went over to her as I checked on her. For some reason I feel so sleepy until Tanjiro came to us as he was making sure I was okay even, for his sister, Nezuko too.

"Serena... I'm so sorry, I didn't protect you. I understand you hate me" Tanjiro said as I put my hand on his cheek even, giving him a close eye smile too. "It's okay, Tanjiro... One thing is good is we all survive together..." I said as he smiled too, until I heard someone coming towards us three. When I look at the person, there was a man with blue eyes and long hair as it was tied up in a ponytail.

"Are you okay?" he asked as he was looking at Tanjiro until his eyes were on me even, he's almost looks like, Darien. When I put my hand on his cheek as his expression was surprise until I broke the silence.

"Darien..." And with that, everything went to darkness as I heard Tanjiro said my name in a worried tone.