Sanpei Mihira, a native of a rural fishing village, has a laid-back demeanor except when it comes to fishing, where he becomes intensely focused. His passion for the sport is unmatched, and he participates in local fishing contests to hone his skills. With a natural talent for fishing, Sanpei faces various challenges in the village's diverse aquatic environments, which range from rivers to the ocean. As he navigates these competitions, he develops problem-solving skills and learns from his mistakes.