From a young age, Hiyori Yamakawa observed her father's many quirks, yet the one pastime she cherished most was fly fishing—a skillful and gratifying way to catch fish. After his sudden passing, Hiyori continued to head to the coast during her free moments, relishing the happiness that her father's keepsake offered.
Three years afterward, Hiyori's mother chose to remarry and organized a celebratory dinner with her new husband, his daughter Koharu Minagi, and Hiyori. Feeling nervous and eager to keep busy, Hiyori headed to her familiar fishing spot when an energetic girl named Koharu Minagi appeared. The two quickly struck up a friendship, with Koharu developing an interest in fly fishing herself. Their encounter was no mere chance: Koharu would become Hiyori's future stepsister, marking the start of precious memories they would catch together as they nurtured their bond. Together, they would share countless adventures along the shoreline.
