At her husband's suggestion, Haruki chose private swimming lessons with Nana, who was an instructor. Unable to love her husband, Haruki harbored secret feelings for Nana. Nana felt lonely because she wasn't getting attention from her husband. During one of the lessons, Haruki kissed Nana. Caught off guard, Nana was shaken, but Haruki's warmth began to open her heart… Gradually, they became more passionate with each other, deepening their love. This change also started to affect their respective families…
