Musashi Kazama, an elementary school student who had no interest in fishing, had to move to a village deep in the mountains due to the work of his father, Takehiro. Musashi doesn't like the countryside, where there are no arcades or convenience stores, and tries to escape, but he is completely fascinated when he comes across the famous "Miracle Jim" fishing for bass. In fact, Musashi's grandfather, who disappeared three years ago, was the world-renowned angler "King of Grander" Motoharu Takigami, and Musashi's mother, who also disappeared, was one of the five most famous anglers in the world. Musashi, who had inherited his blood, awakened to his natural talent, met Kojiro Iwabuchi, a genius fishing boy, and rapidly became absorbed in fishing. On the other hand, Yoshitaka Kuki, one of the Four Heavenly Kings of the Fishing Demon Army, who is a descendant of the Nine Demon Water Army, appears in front of Takehiro. Behind it was the shadow of "Gengo Onido, the general of the Onido Group", who was aiming for supremacy in the world of fishing. An anime of a popular fishing manga jointly planned with Shogakukan "CoroCoro Comic".