I think this could make a pretty good serialization. I'd love it if the heroine was portrayed as a young girl who died and was clinging onto what little she could so that she wouldn't break down at her reality, and then our Mama comes along and comforts her.
Not bad, but I was really hoping that it'd be like Mieruko, where the big scary dude was being followed around by a bunch of ghosts who cared for him, like his past wives and some soldiers.
I know why he says that, but he really should make it female. A male can mate with any number of creatures at any given time, a female can only mate with one.
Time for his skills to shine. All these new adventurers walking around with their fancy shmancy magical gps don't have any idea how hard people had it in Dan's time.