How much of the Black God (Kurokami) manga was adapted into the anime, as in up to what chapter/volume?
Most humans do not know that every person is one of three doppel liners, three people who share the same fate, and that god-like beings called mototsumitama protect the natural balance of power in the world. However, Keita Ibuki, a videogame programmer from Tokyo, is suddenly drawn into the intrigues of the mototsumitama during a chance encounter with Kuro, a young mototsumitama who makes a contract with Keita in order to save his life. Along with Keita's childhood friend Akane Sano, the pair begins to investigate strange disruptions in the natural balance of power that seem to be connected to a powerful clan of mototsumitama.
- http://www.animenewsnetwork.com/encyclopedia/anime.php?id=10262
The ending of the anime:
Akane is getting married to Keita, and thanks Kuro for allowing them to reach that point. Several decades later, Kuro receives a telepathic message from a very old Keita. He tells her that he will take the curse with him, thanking her for giving him a happy life. Keita died afterward just before his grandchildren come to get him for dinner. A relieved Kuro then tells her beloved Contractee to rest in peace. -http://en.wikipedia.org/wiki/List_of_Kurokami:_The_Animation_episodes