Well, you can't get much more AU then this ^_^ Like it very much.
It looks right like an illustration to a Mishima Yukio-novel: the time period, the homoeroticsm, the traditions, the slight gloom and of course the country.
It also reminds me fiercely of some of my favourite Japanese Online-RPG-sites where the players can request/buy tons of chara/storyline/season/whatever pics from a number of associated illustrators: Engawa-scenes of every variety, including lots of shonen ai themed ones, crop up a lot there. This could really be one of those! Quality-wise too.