Sohei is an ordinary 42-year-old businessman, living a comfortable suburban life with his faithful wife and adorable daughter. Everything seems to be perfect but Shohei feels something is missing. Every night, on the train home from work, he sees a beautiful lady gazing out from the window of a shabby ballroom dance studio. Although Shohei's original motivation for learning to dance is to meet Mai, the young woman in the window, he starts to get involved with the class and enjoys the lessons. He doesn't dare tell anyone about his new hobby... not even his family. Mai notices Shohei's new passion for dancing, and agrees to help coach him for the upcoming competition. At one time, she was one of Japan's finest ballroom dancers, but her father has forced her to stop dancing professionally and teach amateurs so she will discover why she failed at the famous Blackpool competition. By teaching Shohei, she rediscovers the joy of dance...