During the 1970s Otsuka appointed Shintani the Supreme Instructor of Wado Kai in North America.
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3
Masaru Shintani, at the age of 13, began to study Shorin-Ryu karate in the
Japanese camp under Kitigawa.
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4
In the late 1950s Shintani moved to Ontario
and began teaching karate and judo at the Japanese Cultural Centre in Hamilton.
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5
Shintani and Otsuka visited each other in Japan and Canada several times,
the last time in 1980 two years prior to Otsuka's death.
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6
In 1958 Otsuka invited Shintani to join his organization Wado Kai, and in 1969 he asked Shintani to officially call his style Wado.
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7
In 1979, Otsuka publicly promoted Shintani to hachidan(8th dan)
and privately gave him a kudan certificate(9th dan), which was revealed by Shintani in 1995.