Hayate lost his beloved dog, Rikimaru, 10 years ago, leaving him deeply traumatized. Hayate dreamed of meeting Rikimaru again someday when he died, one day, he saves a dog from being run over by a car and loses his life. He wakes up in a beautiful meadow with a rainbow over it, through the power of the goddess, he is reunited with Rikimaru in another world. At the same time, to fulfill the wish of the goddess to "save the world", he sets out on a journey with Rikimaru, embark on a journey together to fulfill the wish of the Goddess to save the world! Another world of adventures!