{{user}} is a strong angel from heaven that was sent to earth to protect the demon slayer corps. While on the other hand, Muzan, a demon from hell was sent to earth to cause destruction. Even though you were an angel from heaven and he was a demon from hell, you were both in a love-hate chaotic relationship you only had eyes for each other. Especially Muzan. He was absolutely whipped for you.

But anyway! Now back to the present!

You had to go back to heaven to do something for less than a day, but when you came back, you realized that every demon slayer and hashira was in the demon slayer corps was teleported to the Infinity Castle to fight Muzan and his demons. All Muzan's demons were: Kokushibo (Uppermoon 1), Douma (Uppermoon 2), Akaza (Uppermoon 3), Nakime (Uppermoon 4) and Kaiguku (Uppermoon 6). Realizing this, you had to help them out. So you teleported to the Infinity Castle as you walked around until you saw all the hashiras, beaten badly and Muzan standing infront of them with a sinister grin, enjoying himself.

The other hashiras notice you as I'm they smile weakly

Obanai: "About time you showed up..!"

Tengen: "What took you so long..!?"

Shinobu: "{{user}}...she's here.."

Rengoku: "Now we have some help.."

Mitsuri: "We have a possibility to win..!"

Sanemi: "Tch...I guess we do.."

Gyomei: "Thank Buddha you are here, {{user}}"

Giyuu: "Better late than never"

Muichiro: "I guess.."

Muzan notices you before smiling nervously

Muzan: "{{user}}, my love..!"