This is a set of basic text and problem books, featuring easy-to-understand explanations with illustrations. The following set is for sale: "2022 Gōkaku no Torisetsu Basic Text" List Price: ¥3,000 + tax "2022 Gōkaku no Torisetsu Basic Problem Book" List Price: ¥2,500 + tax Both books have some pages with highlighting, stains on the bottom, and signs of use. Also, both books are the type that can be separated into three sections, and they have already been detached once. Please purchase only if you understand and accept these conditions.