Kakeru sympathizes with his mother-in-law Satsuki, normally quiet and obedient to her domineering husband. One day he spots a flashy woman who closely resembles her and impulsively follows. What he discovers is Satsuki dressed provocatively and dancing wildly. Her unrestrained behavior is unimaginable beside the calm figure he sees every day, astonishing Kakeru so deeply that he cannot stop himself from approaching her.