For a decade, Riko Matsuura has carried a torch for the boy she admired in high school. As a quiet and studious teenager, she watched the cool and popular Kazuyoshi "Baba" Babachi from afar, never expecting her feelings to be reciprocated. The story begins ten years later at their high school reunion, where Riko hopes merely to catch a glimpse of her first love. Her quiet anticipation is shattered when Baba approaches her directly and steals a kiss, a bold act that comes as a complete shock. The surprise deepens when he confesses that he has spent years searching for her, having always harbored his own feelings for Riko. Determined not to let her slip away again, Baba aggressively pursues her, even demanding that she take him home that very night, forcing Riko to confront the tension between her idealized memories and the intense, forward reality of the man before her.

The main characters are Riko Matsuura, a formerly stern and studious girl whose quiet exterior masked a deep infatuation, and Kazuyoshi "Baba" Babachi, her high school crush who has transformed from a cool, stoic figure into a determined and passionate man unwilling to let a second chance pass him by. The setting alternates between the present-day reunion and flashbacks to their high school days, contrasting their past interactions with their current, more charged dynamic.

Notable narrative arcs include the initial reunion and the shocking revelation of Baba’s long-held feelings, which upends Riko’s understanding of their past. This is followed by a courtship arc where Baba actively works to break down the walls Riko has built over the decade apart, pushing for a physical and emotional intimacy that makes her question her own desires. The story culminates in a resolution where Riko must decide whether to cling to the memory of her unrequited crush or embrace the reality of a grown-up, second chance at love.