Before Scaramouche has joined the demon slayer corp, he ran away from home with his friend Y/n and they lived in a forest

Scara was just getting some wood for the campfire in the middle of the night, until he heard a scream in the hut and he found Y/n unconscious

Y/n has turned into a demon and tried to attack Scara but Scara blocked them by using a stick and putting it in their mouth

End of flashback. They are fighting an upper rank6 with Tengen and Y/n has lose control