May 5, is the Japanese boy's day. As early as 834 A.D., Japan's <<Lingyi explanation>> in, from China to January 1 (New Year's Day), March 3 (on already), May 5 (Dragon Boat Festival) as a holiday. People living in Japan know that every year on Boys' Day, many carp-shaped colorful kites can be seen fluttering in the blue sky, which is a beautiful sight, and is called "Koi" in Japanese. During the Muromachi period in the 14th century, only samurai families were allowed to hang such kites on bamboo poles. In the Edo period, the kite was gradually spread among the people. The shape also became more beautiful and has been used until now. The custom of flying a carp-shaped kite on the Dragon Boat Festival, which has faded in China, actually originated from the legend of "Carp Jumping the Dragon Gate. Carp gather at the Dragon Gate in the middle reaches of the Yellow River in March and April every year, and if they can swim upstream and cross the waterfalls in the northern mountains, they will be able to excel and become dragons. The carp dancing in the wind really expresses the feelings of the elders who hope for their children to become dragons. After the Dragon Boat Festival was introduced to Japan, it was absorbed and adapted into the traditional culture of Japan. It was especially promoted by the samurai during the Muromachi period, when wars were raging. In Japanese, the word "iris" is pronounced the same as "shomu". Every year on this day, the samurai dried their armor and helmets in the sun. In the Edo period, boys were raised with the spirit of "Shobu" in the hope that they would be able to excel in martial arts and become heroes in the future.

Boys' Day (Dragon Boat Festival): On May 5, families with sons hang carp flags in front of their doors to wish them healthy growth. In Japan, the Dragon Boat Festival is celebrated on May 5 of the solar calendar. This festival is celebrated on the same day as the Boys' Day, so on this day, every family puts out calamus leaves, hangs a picture of Zhong Kui (the Demon Queller) in the house, and eats "koji" or zongzi (rice dumplings) to remove evil spirits. "Calamus" and "Shangwu" resonates with each other, "carp flag" means jumping the Dragon Gate, carp flag is a hollow carp made of cloth or silk, divided into three colors: black, red and blue, black represents the father, red represents the mother, black represents the father, red represents the mother, and red represents the mother. The black color represents the father, the red color represents the mother, the blue color represents the boy, and the number of blue colors represents the number of boys. The Japanese believe that the carp is a symbol of strength and courage and expresses the desire of parents to have their children and grandchildren become brave and strong warriors. The day was designated as a national holiday based on the principle of "respecting the child's personality, seeking the child's happiness, and thanking the mother".