Japan celebrated the children’s day last May 5th. This day is to celebrate only the boys as girls are celebrated on doll’s day.
Similar to doll’s day, families with boys decorate the house with a Japanese warrior helmet, and lately with the full Japanese warrior armor. Additionally Koi nobori flags are raised on that week, symbols of a strong and healthy boys. The three Koi (carp) represent the Father, the mother and the boy.