I'm removing the markings with nail polish remover. There are no other noticeable stains. If you understand that this is stored at home, I would appreciate it. (^^) This is the March 2025 issue of "Shizen-Kinderbook," a monthly picture book series for childcare published by Froebel-kan, with the theme "Kankaku Asobi" (Sensory Play). This picture book is part of a series that focuses on nature observation and is aimed at a wide age range, from 4-year-olds to elementary school students. Series Name: Shizen-Kinderbook Issue: March Theme: Kankaku Asobi (Sensory Play) Publisher: Froebel-kan "Kankaku Asobi" features magic tricks using cups and water, and explores the mysteries of how things appear, allowing children to have fun playing with their senses.