16-year-old Makoto Niwa thinks he's about to live the dream life: with his parents conveniently away on business, he moves out to the big city to live with his 39-year-old aunt, Meme Touwa. Cue dreams of having the house all to himself, surrounded by pretty city girls and living out a normal adolescent life.All that comes to a screeching halt the moment he steps into Meme's home to find a young girl — Meme's hitherto unknown daughter and his cousin, Erio — wrapped in a futon lying on the front step. Worse than that, she speaks strangely. And thinks she's an alien.Denpa Onna to Seishun Otoko is a series of light novels written by Hitoma Imura, which follow Makoto as he finds out more about his confused cousin and her strange beliefs about how their entire lives are nothing but a huge alien experiment.An anime adaptation by Studio Shaft began airing in April 2011.
Tropes in Denpa Onna to Seishun Otoko include: