Does my Japanese health insurance cover me (non-Japanese national) abroad?

I am a resident but not a national of Japan. As I am employed as a researcher by a university, I enjoy the benefits of compulsory health insurance.
I intend to travel out of Japan at least twice this year. In case I fall ill or get into an accident abroad, will my Japanese health insurance provide coverage equivalent to that I would receive if I were to stay in Japan or should I buy health/travel insurance just in case?
I am not interested in most of the other benefits of travel insurances, only in mitigating possible health-related expenses.
Unfortunately, I have gotten conflicting answers on the internet with some sources saying I will be covered and others saying I won’t — both to the best of my understanding.
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Does Japanese health insurance cover overseas?
Will Japan's Healthcare Cover Japanese Citizens Abroad? Should you pay for healthcare services while traveling overseas, Japanese health insurance will reimburse you for up to 70% of the cost of equivalent treatment in Japan.Is Japanese health care system willing to accept many overseas Heath tourist?
National Health Insurance (NHI) Non-Japanese residents with residence cards (Zairyu Card) who will stay more than 3 months can join National Health Insurance. Japanese hospitals and clinics do not accept insurance from overseas.What does Japanese health insurance cover?
Japan's National Health Insurance (NHI) system is supported by the regular NHI tax (premium) contributions from healthy NHI members that allow them to be ready for serious illnesses and injuries. NHI helps members pay incurred medical costs and maintain a healthy lifestyle. income level pay 30%.)Is Japanese healthcare universal?
Japan's statutory health insurance system provides universal coverage. It is funded primarily by taxes and individual contributions. Enrollment in either an employment-based or a residence-based health insurance plan is required.Health insurance in Japan for foreigners
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