If you liked the C: The Money of Soul and Possibility Control anime, the Anime-Planet community thinks you'd like:
One night, Madoka has a terrible nightmare – against the backdrop of a desolate landscape, she watches a magical girl battle a terrifying creature, and lose. The next day, the teen's dream becomes reality when the girl – Homura – arrives at Mitakihara Middle School as a transfer student, mysteriously warning Madoka to stay just the way she is. But when she and her best friend Miki are pulled into a twisted illusion world and meet a magical creature named Kyubey, the pair discovers that magical girls are real, and what's more, they can choose to become one. All they must do is sign a contract with Kyubey and agree to fight witches that spread despair to the human world, and in return they will be granted a single wish. However, as Homura's omen suggests, there's far more to becoming a magical girl than Madoka and Miki realize...
While these series may seem miles apart, they both focus on a main character that can't completely decide which world they want to live in and what they want to do with it. Eventually, they finally decide and cause a very similar ending in each. Without spoiling, all I can say is if you liked the ending in one, or the struggle to decide what's right and wrong, and who to believe, it's definitely worth giving the other one a try.
In a bizarre fantasy world, students known as meisters are trained at the illustrious Shinigami Weapon Meister University; but the tools they wield are no ordinary weapons! Each meister is paired with a human-like being who can transform into a weapon at will; and after defeating a pre-kishin - a human whose soul has darkened - the weapon eats the soul within it. A meister's ultimate goal is to collect ninety-nine pre-kishin souls and one of a witch so that his or her partner will become an all-powerful Death Scythe. Maka and her partner Soul Eater; Assassin Black Star and his partner Demon Blade Tsubaki; and Shinigami's son Death the Kid and his partners the Demon Twin Pistol Thompson Sisters each vie for their ultimate goal, but plenty of challenges and adventures lie in their way!
If you liked the concept of humans and sentient weapons working together in battle, and the secret organizations they work in, then you’ll probably like both of these series. They both also talk about the ethics behind how a weapon is treated, and feature heavy plot mixed in with action.