In a town where a dolphin sighting signals impending love, Natsume Shirahama encounters Umika, a girl with a dolphin ornament. Despite his lingering feelings for his past crush, Haru, Natsume finds solace in spending time with Umika. As they bond over games and academics, a bittersweet sense of renewed affection blooms, intertwined with hints of unrequited emotions from others, echoing past loves.