Marina Hishimori is the captain of the swimming team at a strong school. Beautiful, academic, athletic, admired by her juniors, and an excellent coach. This perfect girl looks down on the male team members who try to win by using dirty tactics. However, one of her favorite team members falls ill with a disease. The only doctor who can treat the disease is the grandfather of one of the male team members whom she hates. In exchange for expensive treatment, Hishimori has to enter into a “sex friend contract”. Will this noble girl be able to survive?!