The love story kind of feels out of place for Japan.
Now, I gave this movie a 10 and I cried at the end, but the love story does seem out of place for 20th century Japan.
The idea that this upperclass company man at Mitsubishi was going home to an empty house, and not married in his early 30's while his company was priming him for a leadership role and letting him travel overseas is simply not based in the reality of Japanese life at ANY point in history, much less the early 20th century. His family would have arranged him a wife in(or maybe even before) College and if they failed to do so his Manager would have taken on that role as soon as he got to Mitsubishi in an attempt to keep with the norms of the time, to make him more loyal to the company, and to make him a better worker as even implied by his friend Honjo.
The fact that a love story, in this way, was developed almost made me feel like I was not even in 1930's Japan at all, but more like a western nation.
I know it was made up, and that the real Jiro was married and living with his two kids and mom by the time he was heavy in the design in the 30's, but it did come across as weird. Even Miyazaki, a man who has always had a respect for older Japanese customs and life, would be able to represent it in a much more realistic way.