Denpa Onna to Seishun Otoko

Also known as:  Electromagnetic Woman and Adolescent Man, Denpa Girl and Youthful Boy

The TV anime series Denpa Onna to Seishun Otoko is created by studio Shaft, based on a light novel series authored by Hitoma Iruma and illustrated by Buriki. The story revolves around an ordinary high school boy named Makoto Niwa and his cousin, a mysterious girl named Erio Touwa. There is a rumor in their town that aliens watch over it. Erio tells Makoto that Earth has been targeted and says she is an alien herself. (based on ANN synopsis)

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