Immediately notify the police when you are exposed to danger, have an accident, be robbed, etc. 

In case of emergency, call 110 to call in police officers to the scene.  

In case you need medical attention due to illness or injury and you have difficulty in speaking Japanese, it is highly recommended to bring someone who understands Japanese. That way is much faster to get proper medical consultation.

When there is an urgent need, call an ambulance.

Guide for Ambulance Services  pdf 2.03MB

※If you are not an enrollee of any of Health Insurance schemes in Japan, you may be charged a large amount as medical expenses.  Be sure to enroll in the National Health Insurance scheme or an Employees's Health Insurance scheme in Japan.