Serena's POV:
I was looking around the infinity fortress as I was keeping my guard up until I found Tanjiro & Giyu fighting Akaza.

"Breath of the Moon Fifth Form: Moon Prism Slash!" I said as I slice his arm off even, landed on the ground too.

I looked at him as Akaza was shock to see me again. Tanjiro & Giyu were really happy to see me as I came next to them even, I was glaring at Akaza too.

"Didn't expect you to get here in time" Akaza said as he saw my injury. This got Tanjiro & Giyu's attention on me until they saw my injury too. This was terrifying of this as I was standing there. "Serena! Your hurt! You can't fight him with that injury of yours!" Tanjiro said as I looked at them.

"I'm okay, guys. Don't worry of me" I said as I was getting ready to fight Akaza. "You know, Serena. From the beginning, I don't really like fighting girls until you came along" he said as Akaza was in his fighting pose even, he's using his demon blood art too.

"Akaza really doesn't want to fight girls. He'll try to kill Tanjiro or Giyu. One thing is, I'm glad Kyojuro is not here with us too" I said to myself as I was about to attack him until I saw Kyojuro came as he attacked him. "Third Form: Blazing Universe!!" Kyojuro said as Akaza quickly gets away from him in time.

"Oh? The Flame Hashira came to have another rematch?" I asked as he smirk evilly at Kyojuro. "I'm not letting you hurt her! I won't allow it!" Kyojuro said as he was in front of me even, he was glaring at him too.

"K-Kyojuro?! How did you get here so fast?!!" I asked Kyojuro as I was so confused of him.

"I used my breathing technique to get here until I saw you, Tanjiro & giyu fighting the Upper Moon" Kyojuro said as I understand now. Everyhting makes sense too. "We need to do this fast, guys! We don't know if, the others are in trouble!" I said as three of them nodded at me until Akaza started to talk.

"I have a question for you, Serena" Akaza said as Kyojuro was still in front of me even, he was trying to protect me too.

"Do you think you can defeat him, Serena?! You don't know, what your getting yourself into!" Akaza said as I was prepared to attack but, I started to cough badly until I cough up blood as it was on my hand. Kyojuro, Tanjiro & Giyu saw this and, they got really worried until Tanjiro realised, what's wrong. "Serena... did you use the Seventh Form? The forbidden breathing technique..?" Tanjiro asked as Kyojuro's eyes widen in fear even, Giyu looks confused & worried at the same time.

"Y... Yes. I did because to get rid of the Upper Moon 2, who killed Shinobu's sister, Kanae" I said as I was hiding my pain. "You killed... Douma. Now you even more impressed me, Serena" Akaza said as he smirks at me even, I was still glaring at him until he was in front of me. I quickly block his punch with my sword but, I was send backwards until I hit against the wall. I hear them calling my name.