I can appreciate that the OP was serious in asking the question. Because although 'people are people', it could be expected (especially if someone hasn't met/talked with many/any people from a particular country) that there might be cultural differences and it's natural to want to be aware of these so as to avoid making horribly embarrassing blunders when meeting with someone from a different country/cultural/background.
I have only actually been out with one Japanese guy, who was 13 years older than me and therefore in a totally different generation to the one the OP is talking about, so probably can't offer many helpful comments.
However the most important thing is of course to get to know someone as an individual, regardless of what country, nationality or cultural background they are from. It is best simply to treat the person with respect and politeness and forget about preconceptions of 'what Japanese boys are like', and things. From there, things will become clearer as you get to know him. And of course, if you are not sure of something, you can always ask him; if you ask in a polite way I am sure he will appreciate that you simply want to know if something is/is not acceptable to him, and probably appreciate the fact you were considerate enough to ask nicely about it.
I think (although I may be wrong!) that it's a little old-fashioned idea that Japanese males 'don't want women to succeed'. ☝ A great many women in Japan have their successful jobs in business, commerce, companies and such. There is the issue whether they get promotion and such high positions/pay as men
but that is really another issue. It's quite far from the 'model stay-at-home young wife' image, really. There are differences in the ways women are perceived and treated in Japan, but these are very complex and subtle and best dealt with in entirely different discussions.
(I know very little about these things.
) But, for example my Japanese ex, if we had ended up getting married, would not have expected me to give up my job or something. On the other hand, he was a well-travelled, open-minded, intelligent person; no doubt there can be found closed-minded uber-'traditionalists' in Japan the same as anywhere else.
If you are meeting with guys living in England but from Japanese parentage it's likely they will be pretty well 'Briticised' if they have lived here all their life, or at least picked up a lot of British cultural attitudes
so there are not so many differences to take into account as there would be if you are meeting with boys who are simply on holiday here from Japan.
But as I said before, better just to meet and talk with him as an individual, and not worry too much about 'cultural differences'!
