Sora no Otoshimono

Also known as:  Heaven's Lost Property, Lost Property of the Sky, Misplaced by Heaven, SoraOto

The TV anime series Sora no Otoshimono (Lost Property of the Sky) was produced by studio AIC A.S.T.A, based on a "heartful" comedy manga about a fallen - and rather hot looking - angel, erroneously classified as an "unidentified mysterious animal" (UMA) at first. This beautiful, voluptuous angel robot (angelroid) falls to earth... into the lap of a lazy high school boy. When its revealed that he is her new master and that she will grant his every request... things get a little crazy.

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Producers, official website and other details: AniDB, ANN, Wiki