A coastal town, where the sea breeze carries the scent of salt and memories. Kazuki, a model student from a wealthy family, attends an elite girls' school perched on a hill. She loves her hometown and lives a sheltered, orderly life, though her perfectionism alienates her classmates. One day, she witnesses a passionate kiss between a stranger and her boyfriend. The stranger is Moeka, a free-spirited girl from a rough public high school. The encounter shakes Kazuki, and she becomes strangely captivated by Moeka and the distinctive scent she carries.

Kazuki and Moeka are opposites in nearly every way. Kazuki is earnest, naive, and privileged, believing in the goodness of her father's efforts to redevelop their town. Moeka is world-weary, blunt, and from a broken home, living with her half-brother Hana while their mother is absent. Despite their differences, Kazuki's persistent, unsolicited kindness begins to break through Moeka's guarded exterior. When Moeka's abusive ex-boyfriend harasses her, Kazuki instinctively intervenes, sparking the first real friendship between them. Yet Moeka, carrying the weight of a childhood without love, struggles to accept that someone could care for her without ulterior motives.

The story deepens as it explores the social and economic divide between the two girls. Kazuki's mother, who clawed her way out of poverty, recognizes her younger self in Moeka and tries to force the girls apart, fearing that her daughter's innocence will only cause Moeka pain. Meanwhile, Kazuki's father, a charismatic but emotionally disconnected businessman, treats people with a disarming affability that masks a fundamental inability to truly understand them. Moeka, feeling she has hurt Kazuki, runs away, leading to a confrontation that forces both girls to articulate their feelings. The manga builds to a climax during a summer festival, where the unspoken tension between them peaks, and culminates in a poignant farewell, as the paths of the two girls diverge under the weight of their circumstances. The final chapters, though compressed, show how their brief encounter leaves an indelible mark on both of their lives, with Kazuki's memories of Moeka forever tied to the scents of the sea and the town.