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Shinjirō Yasaka (voiced by Eirī Kitagawa) is a simple and ordinary high school boy. One day, he is unexpectedly attacked by an unknown creature while walking on the street. In this life-or-death moment, a silver-haired girl suddenly appears from the sky and successfully saves Shinjirō's life. The girl's name is Nadya (voiced by Kana Aomori), and she claims to be from another planet. Nadya tells Shinjirō that she is an incarnation of a demon god, and she has come to Earth to protect him. Thus, Nadya begins living with Shinjirō, accompanying him everywhere. Other eccentric extraterrestrial beings, such as the cold and perverted Koji (voiced by Miyuu Matsuki) and the shy but powerful Ren (voiced by Rie Kugimiya), also appear one after another in Shinjirō's life, completely disrupting his peaceful existence.