Sakurai Mieko, unable to forget her ex-boyfriend Ueki Hiroshi, is visited by an alien named Inuzuka Chako. Chako's goal is to bring back Hiroshi, the alien who has made women all over the universe cry, to her home planet. Mieko, Chako, and Mieko's fiancé, Ishibashi Kazuyuki, embark on a journey to find Hiroshi…