Carlton here..A while back the subject of mandatory bicycle insurance in Kumamoto starting October 1 was raised. I just checked and discovered that my automobile insurance does NOT cover me for 2 wheeled transportation. So I contacted an ardent cyclist friend of mine in Tokyo and he sent me the following links re: bike insurance to help in searching for and choosing a policy.
I hope these will be of assistance to others like me now in need: https://tokyocycle.com/threads/accidents-insurance.831/ https://tokyocycle.com/threads/educate-me-on-bicycle-insurance.8208/ https://tokyocycle.com/threads/its-time-again-for-bike-insurance.8592/ https://tokyocycle.com/threads/personal-liability-insurance.8806/