Osen, a somewhat well-known Edo girl known as Osenchi Komachi, is busy hunting with Kantaro and Shakusuke. Amidst the hustle and bustle of New Year's Day, Shakusuke suddenly notices an artificial plum blossom on his chest. A man sees the artificial blossom and gives him a New Year's gift, but inside the gift bag is a piece of paper with a mysterious message written on it. Sensing that something major is about to happen, Osenchi Komachi and the others try to find out the meaning of the message, but...