This is a set of two books: "The 100-Story House Underground" and "The 100-Story House in the Sea." ① "The 100-Story House Underground" Toshio Iwai ② "The 100-Story House in the Sea" Toshio Iwai ★ These are used items, so there are some minor scuffs on the top and bottom of the covers. Also, book ① has some peeling on the side (see photos). ↓ However, they should be fine for reading. Thank you for your interest.