This is a set of 7 trial DVDs from Kodomo Challenge. There are 3 DVDs for preschool-aged children, 2 DVDs for children in their middle year of preschool, 2 DVDs for children in their final year of preschool, and 1 English DVD for 3-year-olds, for a total of 7 DVDs. The DVDs from different siblings have gotten mixed up, and I believe they were issued between 2015 and 2021. I have confirmed that they all play through to the end when fast-forwarded, as part of this listing.