Recent viral clips in Japan of bullying, including one which later led to a mass murder revenge threat, have sparked concerns in the country about school violence. The latest case centres on an email message sent to the board of education in Oita city, in Kyushu, at 11pm on January 11 warning of an imminent attack. “On Thursday, January 15, I will intrude into the junior high school where the bullying video spread, together with several accomplices, and carry out a mass killing of students and...