Kadokawa Manga Study Series: World History Complete Set This is a complete set of 20 volumes. The cover jackets have all been removed and are not included. Each volume begins with explanations of the historical background and photographs, making them easy to understand and read. Rest assured, this is a one-owner set (I purchased it new for my child and used and stored it). There is a sense of use. Please refer to the photos for the condition of the edges. The yellowing is minimal, and I think they are in good condition. As these are used books, there may be scratches, stains, and folds. Please consider this before purchasing. *Please refrain from purchasing if you are concerned about minor details. Recommended for those who want their children to learn world history through manga, those who want to create a children's book corner in facilities where children gather, and those who want to relearn world history. Many adults may not have studied world history as an elective in their school days. Reading world history again can provide many insights, such as how the historical background and events are connected to the present world, making it well worth reading. Thank you for looking.