The High School Life of a Fudanshi Vol 1 (my copy arrived at last).
Hmm... I think the original manga version is better than the animated version (which obviously didn't have much of a budget). However, I noticed Sean Gaffney (Manga Bookshelf) saying that he felt it would work better in a through-written form, not 4-koma, and I think he has a point. On the plus side, I like the mangaka's art-style and I have to remind myself that it's another Zero-Sum series, so its heart is probably in the right place.