All Japanese operators make it clear from day 1 that commuting (eg. going home) is ONLY available once checked out onto the line. Most agencies fail to inform their candidates about this.
Also having family over during training falls into two categories: it's either totally frowned upon or accepted on a "don't ask don't tell" basis. However accommodation provided is far too small for other than a couple staying in, in any case. Just another fact agencies fail to disclose.
Training is not easy either, high failure rate, as i hear.
Bottom line: expats are a necessity in aviation over there or at least were pre-covid19. I'm not sure about the future, but i have my doubts if it picks up again for the next year or two.
All of the above is second hand info from expat friends working over there at various Japanese operators, but hey this is pprune.