Free! Iwatobi Swim Club (Discontinued)

Aoi Suzuki has always loved swimming, But since an incident with her mother, a famous Olympics swimmer, she quit swimming. Aoi's father was also involved in a car accident a few days later. Her sister also went missing overnight. Aoi fell into a pit of despair. But recovered when she realized the family now depended on her.
What will happen when she meets the swim club?