- "Spring is upon us! Flowers and warmer temperatures are a prelude to summer fun! It makes me want to fly a kite. Or a windsock. Be on the lookout for one!"
- — Bulletin Board, Animal Crossing
The Boy's Festival is an event that is only celebrated in Doubutsu no Mori and Doubutsu no Mori+. It starts on 20th April and ends 5th May. During this period of time, Carp flags will appear around the player's town, and Tom Nook will sell Samurai Suits. Tom Nook will only sell Samurai Suits in Doubutsu no Mori and Doubutsu no Mori+. These items are considered a symbol of strength for the Japanese. This holiday is really celebrated in Japan. In Animal Crossing and Doubutsu no Mori e+, the event was called Windsocks. The Windsocks can also be seen in the early days of May in Animal Crossing, usually starting around Spring Cleaning.
Later, the carp flag was available as a distributed item to Japanese Animal Crossing: City Folk
players. The item's name was the Koinobori (fish-shaped windsock).