IN OSAKA’s strongly Korean Tsuruhashi district, a 14-year-old Japanese girl went out into the streets last year calling through a loudspeaker for a massacre of Koreans. In Tokyo’s Shin-Okubo neighbourhood, home to one of the largest concentrations of Koreans in Japan, many people say the level of anti-foreigner vitriol—on the streets and on the internet—is without modern precedent. Racists chant s