An OVA was planned... then were forced to cancel it due to modest sales of the DVD. They instead worked on Kiss×sis, unfortunately.
The reason why the 5th episode had more Censor Steam than the TV version?
Positive example: head writer Rika Nagase wanted a slightly more dramatic direction with Kana to make her character deeper and easier to sympathize with. She also said that the musical episode was indeed an Affectionate Parody of musicals, along with some inspiration from The Producers.
Screwed by the Network: Inverted. The 5th episode was censored on TV, but the DVD version was also censored with tons of steam. However, the TV version looked like there was no steam, and considering it aired on TV Tokyo (which is an amazing accomplishment to do, by the way), this is jarring.