Sirius 21 <Advanced Edition> Mathematics Vol. 3 Waseda Academy Textbook I erased any writing with an eraser, but I may have missed some, so I'm selling it at a low price. The back cover of the answer booklet has a place where the name was erased. Please check the photos. Purchased in 2024. This is a textbook for difficult high school entrance exams. Please understand that this item has been stored at home before purchasing.