『ねずみくんのチョッキ』 is a popular children's picture book written by なかえよしを and illustrated by 上野紀子. The story follows a little mouse who has a special vest that he loves. Throughout the book, the mouse encounters various friends who admire his vest and ask to borrow it. As the mouse shares his vest with his friends, it becomes a fun adventure filled with friendship and sharing. The simple yet charming illustrations and repetitive text make it an engaging read for young children, teaching them about kindness and generosity.