Guo Jia is the only son of Qun Ying, a Chinese-language teacher in Japan. She majored in the Japanese language at a university in Beijing, and they came to Japan two years ago. Jia did not take long to get used to life in a Japanese kindergarten, and was enjoying himself in Japan. But Qun Ying worried about how she should educate Jia, who is about to reach school age. Her contract to work as a Chinese teacher has not yet expired. Finally, she decides to live in Japan with her husband and son for the time being, and to send Jia to a Japanese school.