Denpa Onna to Seishun Otoko S01

The story is about a high school boy named Niwa Makoto. He is forced to live with his uncle's family because his parents have gone abroad for work-related issues...and that's where he meets his mysterious cousin, Towa Ario. A cousin who always wraps her upper body in a blanket and claims to be an alien!!! And her favorite food is pizza!!! Towa's behavior started when she went missing for six months and was later found floating on the water by the beach, with no memory of those six months...all she knows is that she's an alien, and all she does is wander around the neighborhood with her upper body wrapped in a blanket...now, what do you think happens between Niwa and Towa?