From 'Wintersmith,' by Sir Terry Pratchett.
If 'Wintersmith' were a film, it should totally be a Miyazaki film. I've enjoyed imagining Tiffany Aching as looking like Kiki for some time, and the Wintersmith (in human form) resembling Howl is just too good.
Wintersmith, a Discworld novel, is the third story of Tiffany Aching's coming-of-age, wherein she inadvertently catches the attention and the heart of the Wintersmith, also known as Jack Frost, the personification of winter itself. And his love can be thrilling... but refusal could be deadly...
A wonderful book, and one that I happen to own.
Made in Photoshop using resources from 'Kiki's Delivery Service' and 'Howl's Moving Castle.'