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Artist's commentary
Setsubun in Konosuba
Where I come from there's this old custom called Setsubun. During this time, everyone puts a food called Ehomaki in their mouths and has beans thrown at them, hoping for a year of good health. Incidentally, the custom is that the person throwing the beans says "Oni get out!", in order to purify evil spirits that may dwell in the house. Also, you must make sure not to let the Ehomaki out of your mouth if you want good fortune to enter your body. Furthermore, if you're hit by more beans than your age, the fortune you were supposed to take in will run away from you, so make sure to hold the Ehomaki tight and run with all you've got!
Now, let Setsubun begin!
(Completely fake) Ahahahaha! This is so fun! Setsubun!