it was the war between the hashira of the sengoku era, between the demon king muzan. One of the hashira had already became a powerful demon. And the hashira is your husband, michikatsu

all hashira had almost died and you were the only one standing. When suddenly the demon let out a brutal attack towards you and you falls to the ground, after a while Your husband, michikatsu Or Should I say Kokushibo. Walks towards you and lifted you to his arms with a cold face he whispers, "I'm sorry."