"Tsuri Baka Nisshi" is a comedic slice-of-life anime centered around the daily life and fishing adventures of Densuke Hamasaki, a salaryman with an obsessive passion for fishing. The series blends humor, workplace dynamics, and the serene yet unpredictable world of fishing, offering a lighthearted look at Densuke's escapades both on and off the water.

Densuke works at a trading company, where his dedication to fishing often clashes with his professional responsibilities. His boss, Sasaki, frequently reprimands him for his absenteeism and lack of focus, as Densuke frequently skips work or arrives late to pursue his fishing hobbies. Despite his professional shortcomings, Densuke is a skilled and knowledgeable angler, often sharing his expertise with others, including his colleague and friend, Takurou Sugita. Sugita, while less experienced in fishing, often accompanies Densuke on his trips, leading to humorous and sometimes chaotic situations.

The series explores Densuke's interactions with his family, particularly his wife, Hatsu, who is often exasperated by his fishing obsession but remains supportive. Their relationship adds a domestic layer to the story, highlighting the balance between Densuke's personal passions and his responsibilities at home. Hatsu's patience and occasional exasperation provide a grounding counterpoint to Densuke's whimsical nature.

Throughout the series, Densuke encounters a variety of characters, both in his professional and fishing circles, each contributing to the comedic and episodic nature of the narrative. The fishing trips serve as the primary vehicle for storytelling, with each episode often featuring a new challenge, technique, or location. The series emphasizes the joys and frustrations of fishing, from the thrill of a successful catch to the unpredictability of nature.

"Tsuri Baka Nisshi" is structured as a series of self-contained episodes, with minimal overarching plotlines, focusing instead on Densuke's day-to-day experiences. The humor arises from his exaggerated dedication to fishing, his frequent clashes with authority figures, and the absurd situations he finds himself in. The anime captures the essence of a hobbyist's passion while providing a relatable and entertaining portrayal of balancing personal interests with life's demands.