Japan recently expanded its foreign labor policies due to a shortage of blue-collar workers. As a result, Vietnamese workers are increasingly moving to Japan by acquiring technical trainee visas, in order to find work. However, once in Japan, Vietnamese workers are compensated poorly, forced to work long hours, and experience violence in the workplace. Additionally, laborers are charged high fees in order to acquire visas- by the time workers arrive in Japan, they frequently owe money to recruiters who helped them find jobs.
See "Vietnamese blue-collar workers in Japan seen facing risks as labor system opens up", Linda Sieg & Ami Miyazaki, The Japan Times, March 20, 2019