"Tonkatsu DJ Agetaro" centers on Agetaro Katsumata, a high school student who helps run his family's tonkatsu restaurant in Tokyo. Despite his initial lack of direction, Agetaro stumbles upon the world of DJing after encountering a local club owner and DJ named Yajima. Intrigued by the energy and creativity of the music scene, Agetaro begins to explore DJing, blending his newfound passion with his responsibilities at the restaurant. The series follows his journey as he navigates the challenges of balancing his family duties, school life, and the demanding world of underground music.

Agetaro's growth is marked by his interactions with various characters, including his supportive but traditional father, who initially struggles to understand his son's interest in DJing. Yajima serves as a mentor figure, guiding Agetaro through the technical and artistic aspects of DJing while introducing him to the vibrant club culture. Agetaro also befriends fellow DJs and music enthusiasts, who inspire and challenge him to refine his skills and develop his unique style.

The narrative emphasizes Agetaro's determination to succeed in both his family business and his musical aspirations, highlighting themes of perseverance, self-discovery, and the fusion of tradition with modernity. As Agetaro progresses, he learns to channel his passion for tonkatsu into his DJ sets, creating a distinctive sound that reflects his dual identity. The series captures the dynamic energy of Tokyo's nightlife and the creative process behind DJing, offering a glimpse into the dedication required to excel in both culinary and musical arts.