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His name is called Yoshio Kawashima in real life ( a real person too!) but in the story itself, his daughter didn't say his full name but just say "Yoshio" in short.
The father's name is Yoshio Kawashima. Since it's based on a true story, he was a real person.
In the book, it says the father's name only a few times and usually just says Yoshio.
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