A series of detective mystery picture books for young children, illustrated with colorful illustrations. - Series Name: Oshiri Tantei (Butt Detective) - Number of Volumes: 8 - Author: Troll - Illustrations: Colorful illustrations - Theme: Detective, Mystery - Target Age: For young children Thank you for viewing. Volumes 1, 2, 4, 5, 6, 7, and 8. Volume 1 has a stamp on the cover and a fold on the last page, but the other books are in relatively good condition. Please refrain from purchasing if you are concerned, as these books have been stored by a private individual.