Instant purchase is OK! - Survival in the Deep Sea - Survival of the Human Body 1 These two books are a set. There are no noticeable stains, and there is no problem with reading them. However, this is a subjective assessment, and I have not checked every page thoroughly, so there may be minor oversights. The description of the condition is based on the seller's subjective opinion, and there may be individual differences in how you perceive things such as scratches, stains, sun damage, minor folds on the edges, damage caused by storage, and aging. If you are concerned about minor details, please feel free to ask questions in advance, and I will respond by adding images, etc. Please understand and acknowledge that these are used items before considering purchasing. Shipping will be done via anonymous shipping. Either Yu-Yu Mercari Bin or Rakuraku Mercari Bin will be used, whichever is the cheapest method. However, the shipping method may be changed depending on the size of the package, but in that case, it will still be delivered via anonymous shipping. I will take measures to prevent wetting and folding as much as possible, but I may use recycled packaging materials. No prior comments are required before purchase. Instant purchase is welcome. Thank you for your understanding.