What a weird combination this song turned out to be, but both are certainly related to one person: Sanae.
Skeleton Metalist (No, really. This is the arranger's alias.) delivers quite a powerful punch with those guitars. Ooh, they're impressive indeed. It's what caught my attention to listen to the four vocals included in this album, aside from the album cover depicting a certain "R.H" and "M.K" dueling, which are obviously the two human heroines of the game. I find that quite amusing, heh.
While the...shouts (?) are rather irritating, and the Last Remote part didn't quite get the treatment it deserved, Sanae's theme backed it all up. Overall, a typical doujin vocal.