Ghost of a Blade

So a few days ago I was watching some TV and saw this anime which looked interesting. Unfortunately I had an errand to run. I tried to find it, but can't find anything about it. I vaguely remember that the person who seems to be the protagonist wears green clothes and has light brown hair. Also, I think it was in a medieval setting. Does anyone know which anime this is? Thanks! EDIT: the protagonist is male. He had a sword.