Minato Kiyoumizu is a boy who stopped playing water polo after an accident during the winter of his third year of middle school.

The story centers on Minato Kiyoumizu, a boy who quit playing water polo after an incident during the winter of his third year of junior high school. After entering high school, he makes a promise and decides to try water polo again and join the school's team with his friends. However, the new team will run into problems along the way...