This is a beautifully written story by a Japanese author. It is about true and genuine love, sweetly and simply written. The housekeeper has a new job with a professor who had been in a car accident in 1975. As a result, he has brain damage. He can only remember 80 minutes of the present. However, he can remember everything before his accident, including all things mathematical. He teaches the housekeeper and her son to love the logical world of mathematics. The love, care and concern of these three characters for each other was magical. I highly recommend this book. It is wonderful to read a modern book without the vulgar language and sexual descriptions that so many other writers feel is necessary to depict.