Mihira Sanpei speaks with a Tohou accent and is a down‑to‑earth, cheerful, and optimistic young man. Though he is inexperienced in many things, he has an exceptional sense for fishing and is obsessed with the hobby. Living in a village surrounded by a natural environment that offers diverse fishing challenges, he decides to maximize his potential by entering various fishing contests. As he faces these competitions, Mihira learns to solve difficult problems, learns from his mistakes, and grows capable of catching almost anything from the water. Along the way, he encounters a range of rivals and companions who test and support his skills.