Fresh off the excitement of her camping trip, Yotsuba initiates a very productive session of sandbox play in which she instructs Fuuka how to properly run a bakery. But even more exciting is a visit from Grandma! Yotsuba learns how to value and enjoy cleaning, how not to be rude when hoping for souvenirs, and most important, how to cope when Grandma leaves. But don't worry, she'll be back someday!