Bath, when I lived in Japan, the rice was cooked daily. I don't think I ever saw rice reheated. It never lasted that long TBH, they ate a lot of rice! So it would be kept warm in the rice cooker and served as needed. Then another batch cooked, probaby 2 -3 times a day.
I don't know about Japan, but we have never keep rice overnight either. My mum has probably never even heard of listeria but whenever I was pg I was only allowed to eat rice piping hot too. She would have a fit if I ate cold rice. Even now she insists that her younger grandchildren cannot eat rice that been left sitting until it's gone cold (as compared to cooled after being served hot).
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