Gekokujo Arithmetic: Basic Edition (The Path from a Deviation Score of 40 to 55) Shinichi Sakurai / Mabuchi Classroom Price: ¥2000 #ShinichiSakurai #MabuchiClassroom #Book #Society/Education/Learning I purchased this in like-new condition here last year. I only used it a little for reference and hardly used it at all. There is a wrinkle on the back cover, but the contents are in beautiful condition with no writing, stains, or scratches, I believe. I apologize in advance if I missed anything.