At first, there was only Winter. But this lonely existence was too much for it to bear, so Winter split off part of itself to bring forth Spring. But the earth wished for Summer and Autumn as well, and their creation marked the birth of the four seasons. The changing of seasons became a duty that fell upon humanity, and those tasked with the transition are known as "Agents of the Four Seasons." This is the bittersweet story of Hinagiku and Sakura - the Agent of Spring and her devoted Guard, who set out on a journey to usher in Yamato's first spring in ten long years.
 
(Source: Yen Press)

Once upon a time, there was Winter. Winter was once the only season in the world—but such an existence was too lonely to bear, and so it created Spring to love. Before long, the earth wished for more time to rest in the cycle, and Summer and Autumn were born. The ones who carry the cycle are called the Agents of the Four Seasons. Hinagiku, the Vernal Agent, disappeared from this land ten years ago, taking the season of spring with her. Now, after incredible hardship, she has returned to restore the cycle to its proper state—and, as in the myth passed down since the dawn of time, she sends her love to Winter.
 
(Source: Yen Press)

When the Agent of Spring, Hinagiku Kayo, is abducted, spring itself vanishes—plunging the world into unending winter. Refusing to give up, her devoted guard, Sakura Himedaka, searches for her for years. When Hinagiku suddenly returns, the two set out to restore the lost season, face the past that tore them apart, and reclaim the warmth they refuse to lose again.
 
(Source: Crunchyroll)

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