Izumi (Kento Hayashi) was abandoned by his parents. He now commits burglary, targeting women and the elderly. He is chased by the cops. While on the run, in the mountains of Miyazaki Prefecture, he helps an injured elderly woman, Suma (Etsuko Ichihara). Izumi then stays at Suma's home. At first, Izumi keeps an eye for money that he can steal. The people though in the village think Izumi is Suma's grandson and take care of him. A change takes place in Izumi.

肩负着重要使命，大财团市之宫集团总裁的公子——某名门大学毕业生、现任集团代理社长的市之宫行（林遣都 饰）驱车前往荒川区，准备动员居住在河床的底层民众搬离，为高档住宅区的建设铺平道路。可是他出师不利，刚刚进入荒川境内就被打扮怪异的女子和围着铁皮的小孩子打劫，还惨遭对方扒掉裤子。市之宫家的家训是“不求人，不欠人”，为此他独自爬桥去取裤子，最终跌落河中。恍惚间，他被自称来自金星的少女小珊（桐谷美玲 饰）救了上来，为了报答小珊救命之恩，他答应和对方成为情侣。之后市之宫进入“蛮荒的”河川村，在和河童村长（小栗旬 饰）、星星（山田孝之 饰）、修女（成田优 饰）等一群电波系怪人的相处中，阿行原本自负的心境悄悄发生着变化……
本片根据中村光的同名漫画改编。