"The Sound of Waves" is an anime adaptation of Yukio Mishima's novel of the same name, set on the small, idyllic island of Uta-jima. The story centers on Shinji, a young fisherman living a simple life with his mother and younger brother. Shinji's world revolves around the rhythms of the sea and the close-knit community of the island. His life takes a significant turn when he encounters Hatsue, the beautiful daughter of the wealthy shipowner Terukichi Miyata. Hatsue has recently returned to the island after being raised elsewhere, and her presence quickly becomes a focal point for the island's gossip and intrigue.

Shinji and Hatsue develop a mutual attraction, but their budding romance faces numerous obstacles. Class differences between Shinji's humble background and Hatsue's affluent family create tension, as Terukichi disapproves of their relationship. Additionally, Shinji's rival, Yasuo Kawamoto, also vies for Hatsue's affection, further complicating matters. The story explores themes of love, perseverance, and the clash between tradition and modernity, as Shinji strives to prove his worth and win Hatsue's hand.

The narrative unfolds against the backdrop of the island's natural beauty, with the sea serving as both a literal and metaphorical force in the characters' lives. Shinji's dedication to his work as a fisherman and his unwavering integrity gradually earn him the respect of the community, including Hatsue's father. The story culminates in a test of Shinji's courage and determination, as he undertakes a perilous task to demonstrate his love for Hatsue and his commitment to overcoming societal barriers.

The characters are deeply rooted in their environment, with Shinji embodying the virtues of hard work and humility, while Hatsue represents grace and resilience. Their relationship is portrayed with a sense of innocence and sincerity, reflecting the purity of their emotions amidst the challenges they face. The anime captures the essence of Mishima's novel, emphasizing the timeless struggle for love and acceptance within a tightly-knit, tradition-bound society.