[1] Sekine was born in Ōarai, Ibaraki, and entered the Tokyo Metropolitan Police Department after graduating from Chuo University.

[2] Sekine lost to Oh Seung-Lip of South Korea in the 5th round of the tournament, but won the repechage to face Oh for the second time in the Olympic final.

Sekine was forced to fight defensively for most of the match, but in the few remaining seconds, he tried a Tai Otoshi which put his opponent down onto the mat.

He also worked as an instructor for the Tokyo Police Department, and Heisei International University.

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