This visa is dedicated to providing persons with training in specific areas. The overall visa term is 5 years, although it is divided into 2 phases. You will first spent 3 years training in Japan before returning to Nepal and again go there for further 2 years training program. However they are planning to combine this 2 phase intern program to a single one in which you would not be required to travel back to Nepal and will be able to renew when 5 years visa period is over.