One of the first OVA format adult anime. Based in the 1984 manga Barabanba by Go Nagai.<br><br>
(Source: AniDB)

Baraba is a corsair of the space that arrives to the Earth, along with her loyal grandpa Dagota (a 300 years old robot), to escape of the pursuers interested in seizing the reward hanging from her head. Their arrival to the planet, however, was not the most comfortable: the crossing of a dimensional barrier creates an imbalance that transforms her into an attractive and naked girl, while Dagota turns into a small monster with tentacles. As soon as she sets foot on the Earth, she is assaulted by Chuta Banba, an impeded high schooler desperately searching for his "first time", with whom Baraba begins a life dedicated to the most unrestrained hedonism.  (wikipedia)

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