Dog Days

First Season: Dog Days
Cinque Izumi is a cheerful and athletic half-Japanese, half-English boy who studies at Kinokawa International School in Japan, and has a normal life everyday until he suddenly got summoned to the alternate world of Flonyard (フロニャルド Furonyarudo). The people there look no different from humans, except for one thing; they have animal ears and tails. The one who summoned him is Millhiore, the dog-like Princess of the Biscotti Republic (ビスコッティ共和国 Bisukotti Kyōwa-koku), who requested his assistance in their war against the forces of the feline-like Galette Lion Dominion (ガレット獅子団領 Garetto Shishi Danrei).

After responding to Millhiore's plea, he receives a sacred weapon, the Palladion (パラディオン Paradion), and is appointed as a Hero to fight for Biscotti in a war that unlike the ones in Earth, is waged with special rules and no casualties, in a fashion similar to a sports competition with the purpose to raise funds for the Kingdoms involved, where the winner faction claims a larger sum than the losing side. After winning his first battle for Biscotti, Cinque learns that when a hero is summoned into Flonyard he becomes unable to return to his homeworld, a fact that Millhiore also was unaware of.

The scientists of Biscotti promise to Cinque to find a way for him to return home in 16 days, the remaining time until his meeting with his friend Rebecca Anderson whom he promised to spend the last three days of his Spring Break with. Until then, he decides to keep serving Millhiore as Biscotti's hero.

Second Season: Dog Days'
Three months after his adventure in Flonyard, Cinque 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. The First Princess of the squirrel-like Principality of Pastillage (パスティヤージュ公国 Pasutiyāju Kōkoku), Couvert, scouts Rebecca and convinces her to become their hero. With each of the three nations having a hero, they decide to hold the Union Festival, a special competition between them. Meanwhile, Cinque, Nanami and Rebecca explore the world of Flonyard, having many adventures with their native friends. After the Union Festival ends, the three heroes return home, promising to visit Flonyard again in the near future.