In general most of Japanese businesses, except services or retails are closed from January 1st to 3rd in Japan.
January 4th is the starting day for the New Year; it is called “goyohajime” or “sigoto hajime” or the first working day of the year.
Japanese goes to work on the day, but they do not work. They are at work for Shinto rituals. So, most female workers used to wear Kimono.
If you like to do business with a Japanese company, it is recommended that you contact them after January 5th.