One thing she mentioned in her Japanese tweets that she didn't mention in her English tweets: She was doing porn and stripping not because she loves sex, but because her shitty husband was unemployed and she had to feed her four children (yes, it's four children, not one 4-year-old). Man, talk about paying the price for bad decisions. It's heart-breaking, but she seems to be doing everything she can for her children, and she's very much aware of the fact that her kids will face racism. But fortunately there are way more mixed race children and adults in Japan than there were when I first came here thirty-plus years ago, and these days I see children who obviously have one Black parent playing happily with other Japanese children. I would be more worried that the parents of other children might gossip about their mother's work in the sex industry. But the fathers of other kids who might recognize Sakura probably never see the parents of their children's friends anyway, so maybe she'll be lucky and no one will find out. I also hope she can overcome her apparent feelings of shame about her work. Sex work is still work. It's legal and it puts food on the table and should be respected.
BTW, I've lived in Japan long enough to see cases where the unemployed, deadbeat, philandering dad was a white man. But in those cases, the reaction is "Yeah, that guy's a loser," but when the father is Black (or any non-white foreigner), suddenly the reaction becomes "Black men are losers." Fuck that racist shit to hell and back. Shitty men are shitty men (and shitty women are shitty women). There might be sociological or economic reasons why certain categories of men statistically are more likely to end up as losers, but ultimately every individual is responsible for his own (or her own) choices. You don't need to resort to racist generalizations to say, "Yeah, that's one shitty dude there. Hope he burns in hell."
I have also lived in Japan long enough to know that there are HUGE numbers of white men who come here and treat Japanese women like "fuck toys." You have to be deluding yourself to think that Black men do that more than other men do. One my best best American friends in Japan is a Black man who has a respectable job and is happily married to a Japanese woman and they are both excellent parents to their biracial son. On the other hand, I can think of several Japanese women I know personally who are married to white men who are basically useless.