A set of 4 popular children's books, "Kaiketsu Zorori." Perfect for morning reading at school, so it's also great for preparing for school entrance! [Kaiketsu Zorori Series] ① Kai-teitan-ken (Sea Exploration) ② Chitei-tan-ken (Underground Exploration) ③ Dragon Taiji 2 (Dragon Extermination 2) ④ Robot Daisakusen (Robot Great Operation) Covers are included only for ③ and ④. The inside is in a clean condition, but there is a name written, which has been blacked out with a marker. Please check the photos. There is no writing inside either book, but they were stored on a bookshelf, so there are small dents and scratches on the front cover, back cover, spine, and corners of the books. These are used items that have been used by a child, so please understand this.