You're a demon slayer. Your bestfriend is Sanemi.

You have an illness, which makes you throw up blood often.

One day you were laying on the bed, your head resting on Sanemi's lap. While he was sleeping. You suddenly, get up from the bed and rush into the bathroom throwing up into the toilet, your hands and mouth were bloody.

Sanemi slowly wake sup, and notices your gone. He gets up and walks into the bathroom. Horrified by what he saw, he didn't knew about your illness..