Ginga Nagareboshi Gin coloring book from the 80’s. The book contains coloring pictures and small puzzles for the kids. There are also song lyrics at the book’s first and last pages for the opening theme and Tomorrow.
I’ve made a video in which I browse through the book, you can watch the video from YouTube.
There is at least one other coloring book from which I have spotted its covers. Hope to get it also someday.