In Japan, there are varieties of ethnic groups. 98.5% of Japanese, 0.5% of Korean, 0.4% of Chinese, and 0.6% of others. The kids in Japan have school six days a week for its very important to them. Also, to them it isn't a problem to drink tap water, however if you don't like the smell, just boil it or go to a purification system. When you enter a home, you have to take off your shoes. Before taking a bath, you have to soap and rise yourself outside of the tub before stepping into the bathtub. At restaurants, they mostly use chopsticks when eating, but silverware can be served.