"Tsurikichi Sampei" centers on Sampei Shiratori, a young boy with an extraordinary talent for fishing. Set in rural Japan, the story begins with Sampei living in a small village where fishing is a way of life. Despite his age, Sampei possesses an almost supernatural ability to catch fish, earning him the nickname "Fishing Boy Genius." His skills attract attention from both locals and outsiders, leading to various adventures and challenges.

The narrative explores Sampei's growth as he travels across Japan, encountering diverse fishing environments, from rivers and lakes to the open sea. Each location presents unique challenges, requiring Sampei to adapt his techniques and learn from the people he meets. Along the way, he forms friendships and rivalries with other anglers, including seasoned professionals and fellow enthusiasts. These interactions highlight the cultural and technical aspects of fishing, blending education with entertainment.

Sampei's journey is not just about honing his craft but also about personal development. His passion for fishing drives him to overcome obstacles, whether they are natural, such as harsh weather conditions, or personal, such as self-doubt or competition. The series emphasizes perseverance, respect for nature, and the importance of community, as Sampei often collaborates with others to achieve his goals.

Supporting characters play significant roles in shaping Sampei's experiences. His mentor, Gorou, provides guidance and wisdom, while rivals like Hyouma push Sampei to improve. Local fishermen and villagers often share their knowledge, enriching the narrative with regional fishing traditions and folklore. The series also touches on environmental themes, subtly addressing the impact of human activity on aquatic ecosystems.

"Tsurikichi Sampei" balances episodic adventures with an overarching narrative, creating a dynamic and engaging storyline. The blend of technical fishing details, character-driven moments, and scenic depictions of Japan's natural landscapes makes it a distinctive series within the sports and adventure genres. Through Sampei's journey, the series captures the essence of fishing as both a skill and a way of life, appealing to audiences with an interest in outdoor activities and personal growth.