The manager of Ureshiko's boarding house injures her back while she exercising with a friend. She gives Tatsumi and Ureshiko two tickets to a mambo concert, along with her unofficial blessing of them as a couple. Ureshiko becomes excited at the thought of going on a date and even goes to tell her friends about it, but her happiness is soon dashed when Tatsumi does not show up at the concert at the appointed time...