Anime with 'Good Girls Gone Bad'

[EkaCoralian]

I'm looking for a few series to try out ('guess I'll be picking one in the end) where a girl and a guy are in a relationship, and the girl is nice and sweet at first. Eventually she ruins the relationship by going bad. By the 'bad' point, I mainly mean the girl's pretty much thinking 'what the hell, why not.' xD;
Any shows to recommend? :3

[Kireblue]

I'm not sure what you mean by bad. Do you mean that she gets bored and possibly dumps him?

[EkaCoralian]

Bored's a good word, yeah. But more like she goes and dates other people: she doesn't necessarily have to dump the first guy, as long as it looks like she's toying with him later.

[[madaraxD]]

hmm maybe u like skip beat! ;D

[Kireblue]

You may be able to fake it with Nana. But keep in mind, the girl that actually dates every guy in town looks like she is so innocent. And the girl that looks like a "bad girl" is actually 100% faithful to her boyfriend. (both girls are named Nana)

[CorpseGoddess]

There's an episode of "Ah! My Goddess" where Belldandy accidentally ingests one of Urd's questionable potion pills and becomes uncharacteristically, uh---frisky. There are some funny moments in that one you might be able to twist around with editing. Which episode it is escapes me at the moment, but I remember it was towards the end of the series...

[EkaCoralian]

Thanks for the suggestions! : D Much obliged. ^_^

[Minimoto]

Like School Days?