The source material --- collected 4-koma manga volumes are available here at amazon.co.jp:
Volume 1
http://www.amazon.co.jp/%E3%82%89%E3...7092300&sr=8-2
Volume 2
http://www.amazon.co.jp/%E3%82%89%E3...7092300&sr=8-5
Volume 3
http://www.amazon.co.jp/%E3%82%89%E3...7092300&sr=8-6
Volume 4 (just released this month!!!)
http://www.amazon.co.jp/%E3%82%89%E3...7092300&sr=8-4
(yes, its in japanese. The kanji doesn't have furigana at first.. then it gets added... sometimes it vanishes again -- but the reading level requirement isn't beyond a second year japanese language high schooler who has been paying attention
).
The manga itself is very cheap.. but shipping costs across the Pacific are high it so ordering a few books at once saves on shipping cost.
It is also highly probable that Kinokinuya will have it (haven't checked yet) or other asian import bookstores.
The style is very much "talking heads" if you're familiar with various comic styles, but the imagery is definitely nice to look at. Lots of nice chapter page art and a smattering of colored comics.