Seeing your love for osananajimi's stories, I would like to recommend Sket Dance episode 7. It's a one shot story about osananijmi (yes there's also a bit about the usual main characters but I believe one would enjoy it even without prior knowledge of the series).
My sig pic is from "Kamichu". Lots of posts about it if you dig, it aired in '05 I believe. I actually wrote a short postscript for it recently (I was dissatisfied with the ending) called "Kamichu: Shoukichi/Miko After-story". It's posted over in fan creations. Really good series on the whole - incredible art and animation, a bit inconsistent dramatically but superb at it's very best. My two favorite characters are Shou-chan and Miko - they're the ones in the sig pic - who are supporting characters on the show but big fan favorites.