Nanako is a wife living an ordinary life with her husband. One day, when her water pipes break and she calls for repairs, the worker who comes is a seemingly dull young man, Kawase Mitsuru. Mitsuru has come to Tokyo to train and take over her family's construction company. They immediately repair the pipes, but water gushes out of the pipes. Although Mitsuru is a hard worker, he seems clumsy. A few days later, Nanako meets Mitsuru, who has been fired from his Nanako and looks completely different. She wants to spend one night with him, so she picks up a pen and writes a fake letter to her husband...