This manga didn't amuse me. I found the humor to be slapstick, not subtle or witty in the slightest. I don't see the purpose behind having so many main characters; most of them don't serve much of a purpose, other than to hang around and look pretty.
Anyway, that would all be perfectly acceptable, if that's what you prefer in a manga; however, I couldn't get over the fact that there seemed to be no overlying plot, no arc, nothing. It was just a chapter-by-chapter storyline, almost like one of those crime/police TV shows (that is to say, if you miss a week's episode, you're not losing out on anything).
Simply put, I didn't really like it all. The humor didn't appeal to me, and the fact that THERE IS NO PLOT was a little... irritating. I didn't care about it's similarity to Ouran (which I don't really like, either), as I'm pretty sure this was published a year earlier.
Maybe I'm missing something?