Today, Japan celebrates Setsubun, or the “Bean-throwing Festival”. It signals the start of Spring, thus it is also called the “Seasonal Division”.
In Japan, Spring symbolizes a “new life/year”, (because it also coincides with the Lunar new year), so the people perform Mamemaki, or bean (roasted soybeans, or sometimes, peanuts) throwing, to “cast away the past’s bad spirits”.
A member of the household wears an oni (demon) mask, then other family members and friends throw the beans at him/her, while saying “Oni wa soto! Fuku wa uchi!”
(Demon out! Luck/happiness in!).
It is also customary to eat one bean per one year of a person’s age, plus an additional one bean for the coming year, for good luck. (｡´∀｀)ﾉa