"Oblivion Battery" is a sports anime centered around baseball, blending themes of camaraderie, personal growth, and the challenges of overcoming adversity. The narrative revolves around Haruka Kiyomine, a talented high school baseball pitcher, and his childhood friend Kei Kaname, who serves as his catcher. The two share a deep bond forged through years of playing together, with Haruka relying on Kei's strategic mind and unwavering support to excel on the field.

The story takes a dramatic turn when Haruka loses his memory due to an accident, erasing all recollection of his baseball skills and his relationship with Kei. Despite this setback, Kei remains determined to help Haruka rediscover his passion for the sport and rebuild their partnership. The series explores their journey as they navigate the complexities of high school life, confront rival teams, and strive to reclaim their former glory on the baseball diamond.

Key characters include Haruka, whose amnesia serves as the central conflict, and Kei, whose loyalty and determination drive much of the narrative. Other teammates and rivals add depth to the story, highlighting the competitive yet supportive nature of high school baseball. The series balances intense sports action with moments of humor and emotional resonance, emphasizing the importance of teamwork, perseverance, and the enduring power of friendship. Through its focus on personal and athletic challenges, "Oblivion Battery" offers a compelling portrayal of the highs and lows of pursuing a shared dream.