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|This article is about a/an ally in Choudenshi Bioman.|
Ken Hayase (早瀬 健 Hayase Ken?): Jun Yabuki's former coach and the captain of the Japanese Olympic Archery Team. He tries to investigate Jun's sudden departure from the team in order to convince her to return, only to discover Jun's secret identity as Yellow Four and allows her to remain with the Bioman.