Sakura of DOOM

I suspect you'll like it. It applies a western fantasy sensibility to developing the magic system, systematically expanding the uses, and their implications, of cubical force fields, while sticking to Japanese lore for the characters and antagonists. Tokine, the girl next door, is awesome -- almost as awesome as Yoshimori's mother. There is, incidentally, remarkably little fanservice: in the first 20 volumes, there's exactly one bath scene plus a chorus line of tengu dressed as samba dancers (which almost makes sense in context).

The anime isn't bad, either, fwiw -- pretty faithful to the tone and plotting of the original, but stopping with the heartbreaking spoilers of volume 12, a third of the way through the manga.

Also, the mangaka loooooves architecture, especially elaborate traditional Japanese castles. And cubes. And three-point perspective. But especially castles.

---L.