A middle schooler gets pulled into a fantasy war and immediately discovers that the princess who summoned him actually wants him. The entire show runs on the bizarre energy of a kid who has no reason to be a hero, becoming one anyway because multiple girls with animal ears are depending on him. Dog Days knows exactly what it is: a harem action show that treats its romantic stakes as seriously as its battle sequences, and never apologizes for either.

Cinque Izumi is a regular middle schooler until a mysterious summoning pulls him into Flonyard, a fantasy world where humanoids sport animal ears and tails. The dog-eared kingdom of Biscotti faces invasion from the cat-like Galette Leo Knights, and Princess Millhiore desperately needs a hero to turn the tide. She calls on Cinque, an athletic kid from Earth, to be her champion. What starts as a desperate military scenario turns into something stranger. Flonyard's wars have no casualties and play out more like sporting contests, staged to raise money for the kingdoms involved. Armed with a sacred weapon called the Palladion, Cinque quickly proves himself a successful hero for Biscotti. There is a catch, though: a summoned champion cannot be sent back to their own world. While Biscotti's scientists search for a way home, Cinque keeps fighting on the princess's behalf in a land that treats combat like sport.