After joining the national health insurance system, international students can go to hospitals all over Japan (except a few special hospitals) and only need to pay 30% of the medical expenses. On top of this, many schools pay 10%-20% of medical expenses for students on the basis of 30%. At the same time, international students will automatically join the medical subsidy system for international students after entering school. After using the national health insurance, international students can reduce their medical expenses again through the subsidy system for medical expenses of international students. Under the protection of this relatively perfect medical insurance system, international students in Japan have no worries about seeing a doctor.
If the landlord wants to buy insurance for international students, he can go to Qianbao. Learn more, or you can consult on this issue!
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.