Mirror World of the Water's Surface

Chili is an excellent runner on the girls' track and field team, with legs that are undefeated. However, due to past trauma, although Chili is good at running, she cannot swim. During her first summer in high school, at the suggestion of Shione, a childhood friend and member of the going-home club, Chili sneaks into the school at night for swimming training. And as they train together, a significant fact from their past begins to resurface for both of them.