The Boy's Festival is event that is only celebrated in Animal Forest and Animal Forest e+. It starts on 20 April and ends 5 May. During this period of time carp banners will appear around the player's town, and Tom Nook will sell Samurai Suits. These items are considered a symbol of strength for the Japanese. This holiday is really celebrated in Japan. In Animal Forest e+, the event was called Windsocks.

Later, the carp flag was available as a distributed item to Japanese City Folk players. .

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