Originally appearing in Super Mario Galaxy as a bonus feature that gets unlocked over the course of the game, it's finally available as a physical book eighteen years later. I have to suspect that this has something to do with Rosalina being a significant character in the upcoming Mario movie. There was also a Switch port of the game released this year, and that apparently has additions to the storybook that aren't in the printed volume. The art is very much in the style of watercolors, but still recognizably Super Mario. It's a very melancholy story, with a young Rosalina trying to process the death of her mother, not something that comes up a lot in the franchise. After becoming caretaker to the Lumas, she makes a decision to visit her home planet every hundred years, and that becomes the Star Festival in the Mushroom Kingdom. It's not clear how old she is or how she's managed to live that long, but some form of time dilation might be involved. As I've written before, I understand Rosalina was originally intended to be related to Peach, and she might still be, but presumably a very distant relative from a different era of Mushroom royalty. The book also tells us that Star Bits taste like honey, and shows us that Rosalina had a stuffed Star Bunny before going into space. Anyway, it's nice to have a copy of this.