In a world where only dogs and cats exist, the dogs gained control of and built a kingdom on the only continent while the cats scattered throughout the great sea and repeatedly looted from the dogs. This mutual hatred has led to many years of strife between the two species... Jean, a young dog who was unconventionally born at sea and raised by a cat, lives with his mother Rosa and his adoptive father Azul as the three move from small island to small island. It is Jean's dream to find a place where the three can live together permanently but...!

(Source: Kodansha)