Bicultural families are on the rise in Japan. In 1970, less than 6,000 "international marriages" — where one partner is non-Japanese — were registered, or 0.5 percent of the total. In 2000, the Ministry of Health, Labor and Welfare reported that one in 22, or 4.5 percent, of all marriages that year were between a Japanese and a foreigner. In Tokyo, it's now one in 10.