I purchased this new about two months ago and used one book for studying (the light blue one). The other three books are unused and in good condition. When separating the booklets, the top of the obi (sleeve) on the light blue book peeled off slightly. Please check the condition in the images. U-Can's Takken Shi Kihon no Kyokasho 2025 Edition [Deluxe Appendix "Derutoko Ronten-cho" Full Color 4-Book Set] (U-Can's Certification Exam Series) U-Can Takken Shi Shiken Kenkyukai (Author, Editor)