Dog Days

Republic of Biscotti faces a predicament by the invasion of Galette Leo Knights. In order to save the country, Princess Milchore summons a "hero" from the outer world. Cinque, a junior high school boy living on the Earth, is chosen as the hero. Three months after his adventure in Flonyard, Shinku gets summoned back once again, this time bringing Rebecca with him. His cousin and rival athlete Nanami, also is summoned to Flonyard as Galette's Hero. (myanimelist.net)