The goal of this children's book is to impress upon young girls ("Ages 9-12") to save their "first kiss" for the right guy, and to not give it away prematurely. The "kiss" is a very thinly veiled metaphor for virginity, and is visualized in the story as a glowing orb. The princess in the story does wait, and is rewarded.
It's worth noting that the book doesn't promise that such a guy will come. As the mother explains: "Oh, yes, my dear. I think God will bring a husband to you. But, if he does not, the kiss will be yours to treasure forever."
Clearly this Christian book lines up with the American Evangelical ethic, but does it follow from the scriptures? Sometimes:
1) "While the princess was growing up, the king and queen kept this precious gift [the 'kiss'] safe in their care."
Yes: In the scriptures, a daughter's reproductive role was her father's property. If a daughter was cheapened by rape (Deut 22:28-29) or seduction (Exodus 22:16-17), the damage was done to her father's assets, and he must be paid. The standard bride-price was thirty shekels of silver ($423) even if the father refused to give her up. (There are still vestiges of this in American culture, when the father "gives away the bride" at her wedding.) The reduction in her worth to the father was independent of the cause (whether the depetaling was consensual or not). All in all, it was a violation of the father's rights.
2) In the story, the princess accepts the farm boy's surprise marriage proposal.
No: Marriages were arranged by the father.
3) The farm boy offers his glowing orb of virginity to the Princess, saying "My parents kept it for me until I became a man."
No: In the Hebrew Bible, virginity is an attribute only of women. The word "virgin" is only used with females (save one reference in Revelation concerning the 144,000 men that will be saved (apparently, no women in that saved group)). The scriptures frequently talk of women who have not known a man, but never men who have not known a woman. Indeed, this book is targeted to girls, not boys.
Incidentally, this resolves another question. If a man of the scriptures only had one globe, to which of his possible many wives would he give it to? Approx 40 men of the Bible had multiple wives, including such heavy hitters as Abraham (3), Jacob (4), David (8 + some concubines), and of course Solomon (700 + 300 concubines). Indeed, polygamy is presumed in the law (Deut 21:15-17), which we'd assume is reaffirmed with Matt 5:17-18.