This is a set of 4 books from the Doraemon Study Series. [Set Contents] - Kokugo (Japanese Language) Interesting Conquest: Kanji Dictionary - Kokugo (Japanese Language) Interesting Conquest: Understanding Kanji Stroke Order - Rika (Science) Interesting Conquest: Science Experiments Q&A - Shaka (Social Studies) Interesting Conquest: History of Japan, Volume 1 These books were used by a child, so they show signs of use. They are still readable. Thank you for your understanding of used items.