Leap, Lily and Tad are getting into the lemonade business. The latest chapter in LeapFrog Enterprises’s “Letter Factory Adventure” educational series will see the trio sell lemonade and use the proceeds to buy books for the library.

The 35-minute CGI-animated story—co-produced by LeapFrog Enterprises and distributed by Lionsgate Home Entertainment—will be released in the US on September 9 for DVD, Digital HD, VOD and PPV. With a focus on teaching preschoolers basic addition, subtraction and counting to 20, LeapFrog Letter Factory Adventures: Counting on Lemonade will feature new learning songs and a curriculum commentary for parents.

Since 2008, LeapFrog and Lionsgate have released a dozen animated DVDs that teach kids early learning skills such as vocabulary, science, technology and math.