"The Sea of Fertility" is a tetralogy written by Japanese author Yasunari Kawabata. It consists of four novels: Spring Snow, Runaway Horses, The Temple of Dawn, and The Decay of the Angel. The series explores themes of love, loss, and the passage of time, set against the backdrop of early 20th-century Japan. The narrative follows the lives of several characters, particularly focusing on Kiyoaki Matsugae, a young man from an aristocratic family. The tetralogy delves into the complexities of human relationships and the impact of societal changes, reflecting Kawabata's deep understanding of Japanese culture and philosophy.