It is a world within our world, yet unseen by any human, and the beings here control time and tide and the changing of the seasons. On the day Chun turns sixteen, she is transformed into a dolphin to explore the human world. She is rescued from a vortex by a human boy at the cost of his own life. Chun is so moved by the boy's kindness and courage that she decides to give him life again. But to do this, she must protect the boy's soul, a tiny fish, and nurture it to grow. Through adventure and sacrifice, love grows, yet now she must release him back to the sea, back to life in the human world.
这是一个存在于我们的世界里的另一个世界，不为人类所见，这里的生灵控制着时光，掌管着四季。当椿16岁时，幻化成一只
海豚去探索人类世界。她掉入漩涡中，被一个人类男孩所救，但男孩却因此丧生。椿被男孩的善良和勇气所打动，于是决定让男孩复生。但是这样做，她就要保护男孩的灵魂，一条小鱼，并把它养大。经历了险阻与牺牲，爱情在椿和男孩之间萌生，但是椿必须把他放回海里，让他回到人类的世界。