I'd say Harem Hotel is fairly similar, but it's barely updated
in the last few years (only twice in over 3 years; it used to be every 3-4months. Kinda funny seeing people here complain the previously monthly updates are now a whopping... ten days behind xD)
A shame really; the first characters you meet in both - respectively,
Ryoko in this, and Lin in HH - are extremely similar. Crossover? :P