did you have mass school closures for any length of time? Could you meet inside with family?
Yes, we had one school closure, for about.... 10 weeks in the spring of 2020, I think. The schools made up for it by cutting the summer vacation, trimming other vacation days and cutting out non-core stuff like sports festival practice time, so I think the kids are back on track--my impression only. Of course, attitudes towards education are different here.
No rules about not meeting people indoors, just "advice." We had the "three Cs"avoid poorly ventilated indoor spaces with lots of people. And vague "stay home" advice. No legal mandate. Japan can't do all that much (compared to places like China and HK) to force people to follow infection control rules, partly because in the 20th century Japan's nationalistic regime imposed some very cruel restrictions on people with leprosy, and there was a massive legal case brought by victims' families and a big backlash. Remember the "Diamond Princess" cruise ship back in spring 2020? People were just getting off the ship and wandering back into Japanese society-legally, it was kind of hard to stop them.
Ventilation was properly understood here from early on, and I think this was important---that and the near-universal masking. Also, Japan has been very very slow to get rid of smoking in restaurants and bars, so these places are all kitted out with heavy duty ventilation
systems and staff are in the habit of keeping rooms well aired. I suspect this also helped.