Far from being put off by the backlash, Miyamoto resolved to use her new-found fame to help fight racial prejudice -- in much the same way British supermodel Naomi Campbell broke down cultural barriers in the fashion industry a generation ago.
"I'm stubborn," said Miyamoto, the daughter of a Japanese mother and black American father, who turned 21 today.
"I was prepared for the criticism. I'd be lying to say it didn't hurt at all. I'm Japanese -- I stand up and bow when I answer the phone. But that criticism did give me extra motivation," she told AFP in an interview.
"Now I have a great platform to deliver that message as the first black Miss Universe Japan. It's always hard to be the first, so in that respect what Naomi Campbell did was really amazing."
Social media lit up after Miyamoto's victory in March, many critics complaining the title should have gone to what they called a "pure" Japanese, rather than a "haafu" (the Japanese pronunciation of "half", a word used to describe mixed race).
"I used to get bullied as a kid but I've got mentally stronger, to protect myself," said the model, whose first language is Japanese, screwing up her nose in mock horror when handed an English menu by a waitress.
"When I was small I stood out and always felt I had to fit in with everyone. I'd try not to bring attention to myself, but now I say what I feel. I do things my own way.
