Serena's POV:
I was in a different place as I was looking around until I hear fighting too. I run towards the fight until I saw Sanemi, Genya, Muichiro & Gyomei were fight the demon. Sanemi was about to get kill until I saved him in time by blocking the demon'd attack.

"S-Serena?! How did you get here so fast?!" Sanemi asked in shocked as I was checking on him for a second. "I was running around until I came a cross here, Sanemi. Also, the other Hashiras are okay too" I said as we all hear the crow talk.

"Upper Moon 2 & Upper Moon 3 are defeated!! Upper Moon 2 & Upper Moon 3 are defeated!!" the crow said as Sanemi, Genya, Muichiro & Gyomei were shocked & happy at the same time until Muichiro's expression turned to terrified. "SERENA!!! BEHIND YOU!!!" Muichiro said in fear as I was about to turn around until I found Gyomei hugged me in protection even, he took the hit for me.

"G-Gyomei!!!" I said in fear & worried tone as he was injured. When I looked at the demon, I was now terrified... That demon had six eyes even, he had a number too!

"He's must be... Upper Moon 1! He's the last demon in the infinity fortress! I need to be on my guard now. I don't know, how powerful he is..." I said as I was really scared of him until I saw him looked shocked as he was still looking at me until he begin to talk too.

"It's you..." he said as I was really confused of him. "W-What..?" I asked him as I was still on my guard.

"You must be Serena... I'm Kokushibou. I heard from Akaza... you use the moon breathing teachnique, like me..." Kokushibou said as I was shocked of this. So... he can use the moon breathing technique too?! "Rui is right... he warn me about you, Kokushibou.." I said as I was really scared still.

"So... Rui warn you about me... That's good" Kokushibou said as I got really confused of him until I saw him pulling out his sword. "Uh, oh..." I said as I realised, what's he going to do. Kokushibou moved so fast even, he was in front of me too.

"First Form: Dark Moon - Evening Palace" Kokushibou said as swing his sword at me but, I quickly moved away from his attack.

"He's more powerful, then the other Upper Moons!" I said to myself as I used my breathing technique. "Breath of the Moon First Form: Moon Crystal Slash!!" I said as I swing at him but, Kokushibou quickly blocked my attack on him.

"Your breathing technique is strong even... it's different too" Kokushibou said as I saw him behind me. This is going to be a ugly fight for me.