 If you liked
Nogizaka Haruka no Himitsu
|
 ...then you might like
Sono Bisque Doll wa Koi wo Suru
|
if you like anime which balance the line between horny and wholesome these shows fit the bill. Although Nogizaka Haruka no Himitsu shows her age a bit, it still definitely worth a watch, especially if you enjoyed the more "anime knowledge" parts of My dress-up darling.
Both of these animes are perfect examples of good otaku romances. Both of these animes feature hints of cosplay as well as discussions over specific animes, but there are a couple of main differences.
In Nogizaka, both of the MC's are Otakus, whilst in Dress-Up doll, only the female MC is. Nogizaka also features other segments of the otaku culture, such as Akiharbara and anime conventions.
Nogizaka is 28 Episodes, Dress-up doll is 12 episodes.