Shunkashuutou Daikousha: Haru no Mai

At the beginning, the world had only one season, Winter. Winter, unable to bear its loneliness, gave up part of its life to create Spring. Eventually, the earth's wish brought Summer and Autumn into being, completing the four seasons. The changing of seasons was to be carried out by human children, and those who fulfilled this role were called "avatars of the four seasons."