Why is the game yin set to the Japanese background?

In order to attract players, although there are many monsters, mountain and sea classics and so on in China. None of these styles are popular with young people nowadays. Young people prefer monsters in anime, which is more famous in Japan, and if it is set in Japan, it is logical to dub it with Japanese CV. If the background is China, but the Japanese CV is used, it is a bit out of place. Yin-Yang teacher originated in China, which is widely popular in Japan and has become a part of Japan's unique Shinto. A master of yin and yang is a fortune teller or illusionist. Not only do they know how to look at the stars and face each other, but they can also measure directions, know disasters, draw spells and perform illusions. People also realize that invisible forces, such as fate, soul and ghost, have the ability to dominate these things.