User Recommendations for Gunslinger Girl

These shows both give off a similar mood. They are deeply concerned with psychological warfare, though I won't get too into that due to spoilers. Very dark and sometimes depressing, but also littered with heartwarming moments. They both do a great job at conveying multiple sides to characters.

When it comes to portraying human nature in situations of non-dualist conflict, these series choose to show short personal stories which help you feeling attached to the human beings who are both killing and suffering due to the situation they're in. You're invited to see the world in other way than in black and white. Also, Hidenobu Kiuchi is the voice actor for both male protagonists, Tenma (Monster) and Croce (Gunslinger Girl)