The Gruver-Han-ogi Romance Would not have survived real life.
There is a scene where she is leaving to go to work (her dance company). She has to kiss him around his cigarette. He is sitting on the sofa in his robe, smoking with his feet up on the coffee table, just like any other man of his time, expecting the wife to do all of the work while he lounges. Even the Kelly-Katsumi marriage appears to be her being the good submissive little wife.
Gruver's offer to Hana-ogi is received by her with more sense, i.e. she has thought through the consequences of taking that step; he hadn't, but then the consequences would have been all hers. She would have had to give up dancing, and then there would be the effect on her family to whom her career had restored honor. All of those children he proposed to foist on her would have faced racial prejudice considering that they would be bi-racial in the time when there were laws here against bi-racial marriages. He would likely have been drummed out of the Air Force for breaking the rule, and possibly court-martialed.
In reality, Hana-ogi would have been better off rejecting Gruver.
In the USA, she would probably have had to work at whatever job she could get while he was in jail to support any kids he was able to give her, and watch them grow to try to distance themselves from a heritage that set them apart. She might have ended as a lonely old widow trying to fill her time. At least in her home country, she would have had some standing as a dance teacher.
I used to think this movie was so romantic. Age and wisdom have taught me that it is anything but.