"Atsui zo! Nekogaya!!" centers on the life of Nekogaya, a young man with a fiery passion for baseball, who dreams of becoming a professional player. Despite his enthusiasm, Nekogaya lacks natural talent and struggles with the fundamentals of the sport. His determination, however, drives him to join his high school baseball team, where he faces numerous challenges, both on and off the field. The narrative explores his growth as a player and as an individual, highlighting his relentless effort to improve and his interactions with teammates, rivals, and coaches.

The story delves into the dynamics of teamwork, rivalry, and perseverance, as Nekogaya navigates the competitive world of high school baseball. His teammates, each with their own strengths and weaknesses, play significant roles in shaping his journey. The series also portrays the pressures and expectations placed on young athletes, as well as the camaraderie and conflicts that arise within the team. Nekogaya’s relationships with his peers, particularly his rivalry with a more naturally gifted player, add depth to the narrative, showcasing the balance between talent and hard work.

As the series progresses, Nekogaya’s dedication to baseball becomes a central theme, with his unwavering spirit inspiring those around him. The manga captures the highs and lows of his journey, from intense training sessions and thrilling matches to moments of self-doubt and personal reflection. Through its focus on Nekogaya’s relentless pursuit of his dream, "Atsui zo! Nekogaya!!" offers a compelling exploration of ambition, resilience, and the transformative power of sports.