this was actually the third in a girls with guns "spiritual" trilogy. So if your interested you could check out the first two series Noir (on this site) and Madlax (not streaming anywhere as far as i know so you would have to purchase a copy of the ADV release) both are darker and more serious than Bruja just to warn you though they both have their charm and strong points. Also keep in mind its a theme trilogy so there are no real plot connections between them