Do I have to buy outbound travel insurance to travel to Japan for 9 days and 8 nights?

It depends on your personal choice. Without Japanese social security, it is very expensive to see a doctor in Japan. A fracture may cost1-200,000 RMB. But as far as the degree of public security is concerned, Japan's social security is very good, and the rest are force majeure, such as natural disasters such as earthquakes. These emergencies are unpredictable and the probability of encountering them is not great. Generally, people who buy insurance will not go out of danger. So it's up to you to decide whether to buy it or not. Don't worry, it's generally no problem not to buy it. Personally, if you are free, it is better to buy one, not to mention the problem of money. With a group tour leader, you can coordinate domestic travel agencies to help you in case of an earthquake. If you are free, you can only ask the embassy for help when you encounter major events. If you have insurance, you can also ask the insurance company for help, and the insurance company will give you more protection.