A Japanese doctor has produced a short video highlighting the slave like conditions Vietnamese vocational trainees are subjected to in the East Asian country.

In the video, Doctor Junpei Yamamura from Yokohama interviews four Vietnamese people who were abused and used to work overtime as cheap labour in the Japanese vocational trainee system.

The system invites foreign nationals to train and work at Japanese companies, with the aim of upskilling people for their return home.

But the government’s labour ministry data showed that 4,004 employers who accepted foreign trainees violated labour standards in 2016 alone.

Vietnamese nationals were the largest group of vocational trainees in the country followed by Chinese, Filipinos and Indonesians.

One man in the video speaks of being forced to leave Japan after he lost his eye sight while working at a construction site and being unable to make an insurance claim for his injury.

The Japanese government is reforming the program in the next month and will establish an industry watchdog.