There he won a bronze medal in the men's middleweight division (‍–‍86 kg), alongside Ben Spijkers from the Netherlands.

Osako was born in Nishimorokata District, Miyazaki and began judo at the age of a junior high student.

[1] He entered noble Asahi Kasei of the judo after graduation in Tenri University.

[1] In the days of active play, he was good at Seoi Nage, Tai Otoshi and Uchi Mata.

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