Nahuel lives with his father in a fishing town, yet he has a deep fear of the sea. One day, he finds a magical book that seems to be the solution to this problem, but a dark sorcerer is after it and captures Nahuel's father. This is where his journey to rescue his father and overcome his fears begins。十二岁的海日被妈妈带到内蒙古大草原,偷偷把海日放在牧民阿敏爷爷家不辞而别。小男孩海日突然闯入牧民阿敏爷爷的生活,让他很不适应的同时,又勾起了他对以往生活的留恋。他与海日在一起的生活中,矛盾和摩擦频频出现,同时二人又相互被彼此感动。。