A story of houses and the sea, illustrated with colorful illustrations. - Titles: Chika no 100-kaidate no Ie (The 100-Story House Underground) - Titles: Umi no 100-kaidate no Ie (The 100-Story House in the Sea) - Number of pages: Illustrated on each page - Spine design: Illustrations of different characters for each book - Illustration style: Colorful and detailed illustrations - Theme: Picture books depicting the inside of houses and the sea I bought these for my child, but they were stored away without being looked at much. The "Umi no" book does not have an outer cover, and the "Chika no" book has a crease on the outer cover. Please check the photos. Please purchase with the understanding that these are used books. Thank you for looking.