"A hero who saved the country?! But to me, he looks just like a dog!" One night, Malice, a low-ranking royal magician, finds a badly injured black dog. He names it "Kuro" and decides to live with it in his home, but after a certain incident, it turns out that Malice's dog is the missing "hero who saved the country," Zerek Windsorcoat! But Zerek only looks like a "dog" to Malice. And Zerek himself seems to be obsessed with Malice――!?