In the quiet coastal town of Shiosai, Natsuo Watanabe, a boy from Tokyo spends his summer helping at his uncle's shop, hoping for inspiration. There, he meets Hana, an energetic and playful girl who quickly becomes the center of his world. As they explore the town together, sharing laughter and quiet moments, Natsuo begins to see Shiosai—and life—in a new light. But beneath Hana’s cheerful exterior, there’s a lingering sadness, an unspoken mystery that draws him in deeper....