YOU SAID:
She’s a man in Japan
INTO JAPANESE
彼女は日本の男性です
BACK INTO ENGLISH
She's a Japanese man.
INTO JAPANESE
彼女は日本人男性です。
BACK INTO ENGLISH
She is a Japanese man.
INTO JAPANESE
彼女は日本人男性です。
BACK INTO ENGLISH
She is a Japanese man.
That didn't even make that much sense in English.