Meibo, who is in the second year of high school, is a member of the school swimming team and likes to watch an animation featuring Koteko, a magical girl. One day before the summer vacation began, she became acquainted with Zhaoping, a calligraphy boy who drew Koteko on the roof of the school. Because of their love of animation, they soon became friends. Meibo and Zhaoping talked about their family: she lived with her mother, stepfather and brother. She doesn't remember much of her real father. But a year ago, she received a spell from someone unknown, which made her wonder if it might be a clue to finding her biological father. With the help of brother Zhaoping, they learned about Meibo's biological father: he was the founder of a religion and currently lives in a small seaside town. Swimming team training is just around the corner, Meibo is ostensibly going to attend, but is actually going to go to town to meet his father. What interesting and touching stories will happen this summer?