"The Setsubun Oni"

Synopsis

It's Setsubun today, and Maruko is fired up making a red oni mask in arts and crafts class, but can't quite get the face right. After school, she goes to the library with Tamae to look up oni, where they find Nagayama reading a book about Setsubun. The three of them read up on oni from all over Japan and discover that these monsters, which seemed so scary, are actually gullible and easy to trick. Maruko finishes her mask at home...