May 5 in Japan celebrates Children's Day (Kodomo no Hi, 子供の日). This day celebrates children’s healthy growth and happiness, and you will see carp streamers (Koinobori, 鯉のぼり) hung all across Japan from rooftops to rivers and parks, as if they’re flying in the wind.
This holiday takes place during Golden Week, which includes 4 national holidays consecutively, and is the longest holiday break in Japan.
