Denpa Onna to Seishun Otoko is a Japanese light novel series written by Hitoma Iruma, which was adapted into an anime series. The story follows a high school boy named Makoto Niwa who moves in with his eccentric aunt and his mysterious cousin Erio, who claims to be an alien. The series explores themes of adolescence, identity, and the struggles of fitting in, blending humor with a touch of the supernatural.