Tales from a parallel world.

they live here with their mother their whole life :) More precisely, not with their mother, but with their family clan, unless you are an activist and an excellent student, the hope of the clan, who is sent to study at the most prestigious university in the country/state/region and then put in charge of some family business.

As a rule, language teaching is entrusted not to a philologist with a good knowledge of both Japanese and a foreign language, but to a foreigner with zero or low knowledge of Japanese.

I didn't know that this was also the case in Japan.
In Nepal and Cambodia, a crowd of volunteers and "obsessed" foreigners (mainly Americans, but there are exceptions) teach English using the same principle, knowing only "hello" and "goodbye" in the local language.