Ariel Deluxe (1991)
Original title: デラックス エリアル
Ariel Deluxe is a 1991 Japanese-language sci-fi & fantasy series created by Yuichi Sasamoto and Masahisa Suzuki. It stars Megumi Hayashibara, Osamu Saka and Michie Tomizawa.
Those incompetent aliens are still plotting to conquer the Earth! The only obstacle in their path is the giant, feminine robot ARIEL! But the young pilots have lives of their own... When Kazumi receives a mysterious love letter from a secret admirer, should she cancel her first date just to save the Earth?
(OVA version of the movie of the same name)