What key is Kachoufusetsu written in?

[Quantium]

To me, it sounds like F or G. Anybody know for sure? This song rocks!
I mean, obviously using the Hirojoshi scale, but other then that.

[Milk Chan]

It's in 2 keys (it modulates for a short time) but I can't think of which at the moment.

[Alpha Type 11]

It starts in B minor, then moves into A minor, then moves into B-flat minor, then back to B minor. The descending scale played on the koto is in B-minor. So most of the song is in B minor