"One Pound Gospel" is a sports-themed romantic comedy anime based on the manga by Rumiko Takahashi. The series centers on Kosaku Hatanaka, a young and talented boxer with a promising career. However, Kosaku struggles with a significant flaw: his inability to control his appetite, which often leads to him missing weight and jeopardizing his matches. Despite his dedication to boxing, his lack of discipline in maintaining his diet creates a recurring obstacle in his professional and personal life.

Sister Angela, a novice nun, becomes a pivotal figure in Kosaku's journey. After witnessing one of his matches, she becomes deeply concerned about his well-being and decides to support him in overcoming his struggles. Angela's compassionate and determined nature contrasts sharply with Kosaku's impulsive and often self-sabotaging behavior. As she encourages him to stay focused and disciplined, a unique bond forms between the two, blending elements of mentorship, friendship, and romantic tension.

The narrative explores Kosaku's growth as a boxer and as an individual, highlighting his battles both inside and outside the ring. His relationship with Sister Angela serves as a catalyst for his development, as her unwavering faith in him inspires him to confront his weaknesses. The series balances comedic moments, particularly stemming from Kosaku's overeating antics, with heartfelt scenes that delve into themes of perseverance, self-improvement, and the complexities of human connection.

The supporting cast includes Kosaku's coach and fellow boxers, who provide additional layers to the story by offering guidance, rivalry, and camaraderie. The anime maintains a lighthearted tone while addressing the challenges of pursuing one's dreams and the importance of support systems in overcoming personal struggles. Through its blend of humor, romance, and sports drama, "One Pound Gospel" presents a distinctive take on the underdog narrative, anchored by the dynamic between its two central characters.