Season 1 of Ariel premiered on July 21, 1989.

The Earth is being invaded by aliens. Fortunately, the aliens are so concerned about budgets and the cost of the invasion that they haven't succeeded yet. To defend the Earth, Dr. Kishida has designed ARIEL, a giant robot shaped in the likeness of a woman with body armor. Unfortunately, he has selected his relatives (his granddaughters Aya and Kazumi Kishida, and his niece Mia Kawai) to be the pilots, and they are far more interested in their own lives.

Season 2 of Ariel premiered on January 21, 1991.

Those incompetent aliens are still plotting to conquer the Earth! The only obstacle in their path - 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?