"Sasaki to Miyano: Sotsugyo-hen" is a continuation of the story centered around the evolving relationship between Shūmei Sasaki and Yoshikazu Miyano, two high school students navigating their feelings for one another. The narrative picks up as Miyano prepares to graduate, marking a significant transition in their lives. The series explores the emotional complexities of their bond as they face the uncertainties of the future, including the possibility of separation due to their differing academic paths.

Sasaki, known for his confident and outgoing demeanor, continues to support Miyano, who is more reserved and introspective. Their relationship, which began with Miyano's love for boys' love manga and Sasaki's growing affection for him, has deepened over time. The story delves into their mutual understanding and the challenges of maintaining their connection amidst the pressures of impending adulthood. Themes of communication, trust, and personal growth are central as they navigate their feelings and the expectations placed upon them.

The supporting cast, including friends like Hirano and Kagiura, also plays a role in the narrative, providing additional perspectives on relationships and the transition from high school to the next stage of life. The series balances moments of lighthearted humor with poignant reflections on love and identity, staying true to the tone established in the original "Sasaki to Miyano" series. The focus remains on the emotional journey of the characters, emphasizing their growth both individually and as a couple.