Keisuke Niwa, Shogakukan Complete set. I bought this used as a gift, but I'm selling it because I no longer need it. There is some yellowing due to aging, but since I haven't opened the packaging since I bought it, I haven't checked the condition of each book individually. However, as far as I can see from the outside, there doesn't seem to be much dirt. Please note that this is a used item and is non-refundable and non-returnable (NCNR).