When my Mom Goes to Tsunami Supermarket, Why Can't I Tag Along?

Avi, a curious young girl, has an adventurous day with her Grandma and discovers something special in a supermarket. An inspiring story involving three generations - a Grandmother, a Mother, and Avi. Mom needs to go grocery shopping. Avi is suspicious because mom says, "children are not allowed". When mom forgets her wallet and they must take it to her, right away. Avi goes to this mystery store with Grandma by sneaking in under grandma's coat. What will they discover there?