The child does not want to understand

Minami, a sophomore in high school, is a member of the school's swim team and enjoys watching an anime featuring the magical girl Koteko. One day before the start of the summer vacation, she met Shohei, a boy from the calligraphy department who painted Koteko on the roof of the school. Because of their love for animation, they quickly became friends. Minami and Shohei talk about their family: she lives with her mother, stepfather, and younger brother. She didn't have much of an impression of her biological father. But a year ago, she received a spell from someone she didn't know, making her wonder if it could be a clue to find her biological father. With the help of Shohei's brother, they learn about Minami's biological father: he is the founder of a certain religion and currently lives in a small seaside town. The swim team training camp is about to begin, and Minami is ostensibly going to participate, but she is actually going to the town to meet her father...... What kind of interesting and touching stories will happen this summer?