the ova has more panty jokes than the tv series (but unfortunately the tv series doesn’t have animation nearly as good as the ova), I was able to tolerate them just because the character writing outside of anything to do with sex was consistently high quality and because of the superb animation and music. That scene in the 3rd or 4th episode of the ova where Aburatsubo and Nanaka fly through the empty halls of the school is perfect as is.