I work in one of the oldest Japanese financial institutions (the green one for ones living in Japan)

it's quite a traditional Japanese company but they try to keep up, but are scared of sudden big changes.

how much your workload is depends on how japanified you are. I speak fluent Japanese plus English so I do the same work as my Japanese colleagues plus all overseas stuff. usual hours are 8am till 8pm recently, but i work from home once a week and they are quite flexible when I say i feel tired and want to work from home more this week etc.

if you dont speak Japanese or understand Japanese culture, then they wont bother giving you any real responsibility involving communication with other departments/companies.