Houkago no Pleiades

Also known as:  Hokago no Pleiades, Afterschool Pleiades, After School Pleiades, Wish Upon the Pleiades

The "Hi-Def YouTube exclusive" web-anime Houkago no Pleiades (Afterschool Pleiades) was created as a collaboration between anime studio Gainax and car maker Subaru, with an original story featuring five astral magical girls or... something. They are Subaru, Aoi, Itsuki, Hikaru and Nanako.

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