Xiaoyi tells the story of 12 year old Wap (played by Linia Skog), who quickly grows up and her mother (played by Paula Vaisala) doesn't want to grow up. Wap lives with her mother and has never met her father. One night, Wap had had enough of her cycling companions and her mother. She stole a car and drove north in search of her father. She only knew his name. But her father was not what she expected. Meeting him triggered some events in the lives of Varpu and Siru, making them aware of their roles in each other's lives and the world.