Shun Aoi, the older brother of the main series protagonist Ashito Aoi, was once just as devoted to football. However, his dreams were cut short due to severe childhood asthma, with his first major attack occurring during a tryout for Ehime's J-Club academy. The trauma of this event forced him to distance himself from the sport he loved, leading him to focus on supporting his family and working at their store while Ashito pursued his own path to Tokyo Esperion.

Set primarily in the rural prefecture of Ehime, the spin-off shifts focus away from the high-pressure world of elite Tokyo youth academies to explore the realities of local football and personal setbacks. The story begins when an unexpected opportunity forces Shun to confront his past. Encouraged by a friend, he participates in an intramural match, a small step that reignites his buried passion. During this game, he scores a decisive goal, a moment that symbolizes reclaimed courage and attracts the attention of a coach who recognizes his latent talent.

This leads to the central narrative arc: Shun's second chance. He joins the J2 League team Athletica Club Ehime, embarking on a rigorous journey to manage his asthma while rebuilding his confidence and technical skills. Unlike his brother's overwhelming "Eagle Eye" vision, Shun possesses a "Wide Vision" and a precise left-footed kick. The story follows his struggle to transition from living vicariously through his brother to pursuing his own identity as a footballer, balancing part-time work, family responsibilities, and his athletic ambitions.

A notable narrative arc involves Shun mending his relationship with football and his family. He moves from hiding his desires to openly expressing his goal of playing professionally while self-funding his pursuits. His journey is not about becoming a national sensation but about overcoming personal limitations and proving that it is never too late to try again. The series compresses this comeback story into a focused run, highlighting that courage can be found in returning to the pitch after a painful setback.