 If you liked
Nana to Kaoru
|
 ...then you might like
Nozoki Ana
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First of all, both are OVAs. In Nozoki Ana, it's the girl who plays around with the MC; in Nana to Kaoru,it's the girl. Both Kaoru and Emiru change their personalities when in school, and they're both secretly perverts. Then the MC soon gain feelings from the other. There's romance there somewhere... It's not hentai, but close enough.