Prologue

-God said that our encounter is a fate. Then, I'd like to say that our feelings to each other also a part of our fate-

(y/n) finally take a stronger seat. He finally become a part of the strongest swordman in Demon Slayer corps. He finally become a pillar. One day, while do the mission, he meet with two siblings, both of them are females...
And things slowly changes at their appearances, as the cold heart finally melted and decide to do what it should be...

Have you ever see a butterfly dancing at night?
This night, you will see it...

Kimetsu no Yaiba - Demon Slayer belongs to ©Koyoharu Gotouge