A manga with animal/characters

Hi guys ! I tried to find a manga for my sis. The story talk about an organisation where the characters are half man half animal. The main story is about the white lion and the black cat - something like that ( the black cas is the messenger into the organisation ). I think there a story with a white rabbit and another lion. Brief. If you find this, I'll love you for the rest of my life. (づ￣ ³￣)づ