Child Headquarters Child Science Picture Book Museum A set sale of Why-Why Quiz Picture Books 1-12. Regular price is 650 yen x 12 books, totaling 7800 yen. 2017 edition. Since they have hardly been read, they are in relatively good condition. Many other items are also on sale. #u Other items for sale are here Anonymous shipping and immediate purchase are available. Science, seasons, vehicles, signs, mazes, reading aloud, knowledge, kindergarten entrance exams, elementary school entrance exams, picture books, illustrated books, trivia, educational toys, goods, toys, Kumon, children, kids.