This ebook and music file are a word problem with a narrative that includes Chronos, and ocean deities from various mythologies. It is based on the Japanese myth of the sea god, Watatsumi and his daughter Otohime. The main character is Otohime's husband, Hoori, who is tasked with restoring order to the world by bringing back the map of chaos, which is time. Chronos, and the ocean deities, give Hoori four tasks, which students have to do for him. One of them is math, involving units of time. The other three involve research, and creative and expository writing.
The lessons in this book would be best presented in a one or two-week time frame. The research involved would be good for small groups, as well as for homework.