Aya Natsu was sent by her parents to a faraway planet in a time capsule, waking only when the place she landed in was deemed safe by the computer inside the capsule. That was 13 years ago, when Aya was the age of 3. Now 16, Aya barely remembers her life before the capsule, and knows Earth better than almost anyone, thanks to her computer guardian. Aya is attending the local high school near Capsule Corps. As Aya lives her new, peaceful life, she tries to remember her past and her parents. Her computer can't tell her or show her anything but a picture of two dark-haired, worried adults dressed in simple, expensive clothing.
Aya makes friends at her school, including a strange guy named Gohan and the Japan's idol's daughter, Videl. Can Aya compete with the superheroes Videl and the Great Saiyaman with her own abilities? And will she ever unlock the secrets of her past and destroy the upcoming danger?