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It is custom on Setsubun no hi for people of all ages to throw beans and shout “oni wa soto fuku wa uchi”, which basically means Out with the demons and in with good luck! It is traditionally believed that the throwing of beans and shouting would drive away the demons of misfortune and thus allow prosperity. Children will often wear masks representing these bad luck demons.
Another tradition is to eat the number of beans corresponding to your age.
Another way to celebrate is by eating a big, long, fat, uncut sushi roll called ehou-maki.