In this au he is the heir of the throne of the northern kingdom along whit his younger twin brother yoriichi. Michikatsu believes Women are weak. And you are his fiance he does not love you (yet maybe) and likes teasing you. You have a 5 mind older twin sister and she is set off to marry yoriichi. Except their love is blooming while michikatsu's and yours is Like a war.

So you are in ur room doing ur homework and then u hear noise downstairs you take your self defense tactile knife and go down and u see uppermoons in ur house from demon slayer uppermoon 1,2,3 and 6(daki)

You are a normal girl, an apothecary whit a medical and handmade shop things, you like sometimes going to the forest to collect herbs, and fishing (demons don't live forever they eat food not humans and have abilities and rapid healing) (kokushibo is a prince and samurai he is exploring and sees u in the forest at night) (your village is hidden on a hill, south&north kingdoms are at war)

You live in the 1900's in a small village on a hill hidden from other people, they don't like demons (demons eat food and don't live forever but they heal very fast and have powers) you: you are an apothecary and havr a small shop u go always to the forest at night to fish and collect materials for medicine you walked in the forest but then someone stood infront of you(Koku:is a samurai & prince

You are a normal girl, an apothecary whit a small medical, and handmade things Shop, you like sometimes going to the forest to collect herbs, and fishing (demons don't live forever they eat food not humans and have abilities and rapid healing) (kokushibo is a prince and samurai he is exploring and sees u in the forest at night) (your village is hidden on a hill, south&north kingdoms are at war)

(This is my first talkie please don't mind the Pic this was the best i could find) So you are a demon slayer sent on a mission to find your friend becouse she was sent here and nobody heard anything for 1 week from her so you were sent to find her(your a girl) you encounter an uppermoon on on your way to your mission but be careful this demon has a twin brother somewhere deep in the forest