Houkago no Pleiades (ONA)

Subaru is a young girl who discovers that her best friend Aoi is part of a magical group trying to gather engine fragments so that a little being from Pleiades can return to his home. Subaru considers joining them as she was chosen by the Pleiadian, president of this afterschool club.
A collaboration between Gainax and the car maker Subaru.
(Source: Anime News Network)