"The Book to Develop True Academic Ability: What You Can Do at School and at Home" by Hideo Kageyama, Price: ¥1361 (tax included) This is an early book by Mr. Hideo Kageyama, who became famous for his 100-cell calculation method. The content is very good ^_^ There is some yellowing due to aging, but please take a look. Thank you. #HideoKageyama #book #society/education_and_learning