The author of Tetsunagi Kooni is credited to Aoki Mitsue, but looking at the art styles, I think this is almost certainly wrong. I'm pretty sure this was actually by the creator of Hidamari Sketch.

Just checked, yeah it's by Aoki Ume, artist/writer of Hidamari Sketch (which I love! hope this is just as good!)

last edited at Apr 27, 2011 1:33PM

Thought I had fixed it earlier, but apparently not.
As of now, it's been fixed.