|1972 Munich||-93 kg|
|World Judo Championships|
|1971 Ludwigshafen||-93 kg|
Ishii trained judo since a very young age, at a dojo located near his house, and graduated in pedagogy at Waseda University. He was eager to participate in the first judo Olympic tournamentat the 1964 Summer Olympics in Tokyo, but lost his spot to eventual gold medalist Isao Okano. Frustrated, he quit the sport and decided to emigrate to Brazil, where he would become a farmer. After a sixty-day boat trip, Ishii arrived in Brazil and worked in a farm at a Japanese Brazilian community in Presidente Prudente. After being convinced to fight a local judo tournament for fun, Ishii's skills impressed enough for the inhabitants to ask him to become a judo teacher. Added to Ishii's frustration with the farming life, he started to teach the martial art, eventually opening a dojo in São Paulo. In 1969, Ishii was naturalized Brazilian to take part in judo competitions.
Two of Ishii's three daughters, Tânia and Vânia Ishii, are also judokas.
- Ishii's dojo (in Portuguese)
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