Kemonokko Tsuushin ~Toriko Rupia~ tells the story of Tatsuomi, a sick high school student who tries to call an ambulance one night but mistakenly calls a mysterious service that sends him a real harpy who heals him with one of her eggs. Recovering the next morning, Tatsuomi must deal with the problems of this woman and her excessive sexual arousal that appeared because of the egg she laid to heal him.