Setsubun literally means "division of seasons." It is used to mark the end of winter and summer, and is derived from the old lunar calendar. However, "setsubun" has now come to mean the day before the first day of spring only. It usually occurs around February 3rd. On this day, in a custom called mame-maki, people throw and scatter roasted soy beans inside and outside their houses while saying, "Get goblins out of the house! Invite happiness into the home!" Some people believe that mame comes from the word mametsu which means drive away evil matter, in Kanji.
Some people believe that the origin of Eho-maki is a custom followed at the end of the Edo Period (1860s) in Osaka, of wishing good fortune for fisherman. Also, It is also believed figuratively that Eho-maki resemble a demon’s metal rod, and that demons can be stopped by eating the whole thing.
Eho (the year’s good luck direction) is determined by the year’s zodiac sign. In 2024 this is the Dragon. The goddess of lucky directions, Toshitoku-jin, is believed to remain at the Eho during the year.
In the Edo period, regardless of whether it was erotic or not, the entire Yukaku
"O to na no o a so bi"(Hang out)
, it seems that there was a culture of biting a thick roll(Modernly speaking, "California big roll") and biting it to liven up over drinks.