At her husband's suggestion, Haruki chose to take private swimming lessons where Nana was an instructor. Unable to love her husband, Haruki secretly harboured feelings for Nana. Nana was lonely and ignored by her husband. One day, Haruki kisses Nana during a lesson. It was sudden and upsetting, but the warmth of Haruki's touch at that moment opened Nana's Kokoro... Gradually, their skin began to touch more passionately, and their love deepened. This brought about changes in both of their families as well...