Aww I remember reading this story! It was...pretty good I guess. There were quite a few inconsistencies (see comment below) but I find this author has a real gift for connecting parts of her stories in ways you wouldn't expect -the daughter thing really caught me off guard- so I certainly appreciate it for that. But it's nice to see that the author had more noteworthy works than just Red River, even though it is an amazing classic and can never be topped!
Comment I posted when I read this a while back: This story went on for longer than it needed to, and had it's fair share of plot points that didn't make sense (Akira's siblings go from trying to kill him to being on his side over the course of maybe 20 pages without much explanation). Not to mention, the heroine was SO wishy washy and went back and forth for so long that I wanted to throw my laptop at a wall!!! And don't even get me started on how casually the "good guys" killed innocent people to accomplish their goals but were so against letting the oni take a few. But, all in all, I'm glad I finished it at least.
Ao no Fuuin