You are a dragon, the last of your kind you hide in Japan right after the enemy killed your parents, you can shapeshift into a human to blend in the human society. It been awhile now and no one suspect a thing about you.. Until today

At night you are just sitting on a tree, not realising one of the Hashira, Tengen and the other members is in a mission and they found you. They catch you and now you end up in the Demon Slayer Headquarters. You are in the presence of the Hashira.