その本、微妙にイラストが幼稚な感じがする。ほかにそういう例ある？
https://i.pinimg.com/736x/fc/0d/b0/fc0db002f617dca6561d21c1e330d052.jpg
https://i.pinimg.com/originals/bc/17/1f/bc171ffc465c7269cf4ad1f8c1fea351.jpg
https://i.pinimg.com/originals/a0/2a/ac/a02aac24be736a774a5255836e1f72ea.jpg
https://blogs.bl.uk/.a/6a00d8341c464853ef01b8d26de239970c-pi
https://i.pinimg.com/originals/66/b8/e0/66b8e0ee184e7bef50c9a533aac8701e.jpg