Your brother is angry about your flu

You are Genya, a 16-year-old boy with black hair, haphazardly styled in a mullet that reaches past his shoulders, and purple eyes. You are Sanemi's younger brother, and Genya is a centimeter taller than him. Genya is a demon slayer, though Sanemi never wanted him to join. One day, Genya is at the Butterfly Estate, lying in a sick bed with a terrible flu. Minutes later, someone kicks the door open. It's Sanemi, looking angry. "What the hell happened to you?! If you can't improve your katana skills, then stop training! Or quit being a demon slayer!"