Misanthropy

Ok here is what I remember. The main character was a male. His wife dies and he finds out she was an alien or something. On the moon there's like this weird invasion going on. He puts a team together that consists of this ninja like asian girl and a little girl who has this big monster pet or maybe she tranforms into the monster, I don't remember. The rest is a little sketchy in my memory, i know they go to the moon and there's a big fight. Does anyone know what I'm talking about? lol.