The post office receives a large number of New Year’s cards every year (about 30 per man, woman and child in Japan) and to make deliveries, they hire part-time workers, mostly students, and the post office letterboxes are dedicated to New Year’s cards. It has been modified to include an opening. New Year’s cards account for a large percentage of Japan’s total postal revenue. The tradition of sending New Year’s cards is thought to date back to the Heian period, but in modern times the post office has been printing New Year’s cards was institutionalized when it was started. Lottery numbers were issued on cards after the world warⅡ. Speaking of the zodiac sign, in ancient China, 12 animal signs were used to represent the year, month, day, time and direction. This was also introduced to Japan in ancient times and is called Junisi.