Thanks for putting this up again! Kyiohiko Azuma's first non-doujinshi manga, unfinished probably because he scored a hit with Azumanga Daioh while doing this. I remember back at old Mangafox, there was a list of all their mangas from most to least read and this was one of the 20 least read mangas there, despite being made by Azuma. So I guess it won't be that much read here either, but thanks for your effort anyway. (Yes, I did try out a bunch of the least read mangas back there. Some crazy stuff, but quite a few were a lot more interesting than the bland, watered out crap at the top of the list that most people were reading).
This manga is interesting because you can recognize some characters from Azuma's later mega-hit Yotsubato. People often say that Fuuka was based on Kagura from Azumanga Daioh, but I think that Kokoro here is a much better fit. Also, Emi from this manga is very similar to Ena in Yotsubato, and her big sister minus glasses is a pretty good fit for Asahi.
Wallaby wasn't a big success and was left unfinished, but it's still worth reading if you like Yotsubato and Azumanga Daioh.