Well, it isn't a happy ending.. But, in it's defense, I'm not terribly fond of happily ever after endings anymore.
I wasn't specifically addressing paper control powers when I said I enjoyed it, and I'm fairly sure it doesn't exactly match the genres I was being picky about, but I've been meaning to watch it eventually. I'll place R.O.D. in the queue for good measure.
Beneath Shigofumi, because a brief search of the title turned up slightly more appropriate genre results. Sankyu.