Nakagawa Kana has worked hard all her life to become a successful competitive swimmer. Under her father's pressure, she is aiming to become a representative at the next big swimming competition for her school. Life is much like a swimming race, every second counts, and to Kana doing anything else other than being the best is pointless. One day, she gets caught in one of her shoplifting acts – something she does only for the thrill rather than for the product – by her childhood friend, Daisuke. Without much consideration, she pulls him to a nearby hotel where they spend the night together. However, Kana does not expect what happens afterwards would affect everything she has worked for.