 From 1992 to 1998 he was principal conductor of the Yomiuri Nippon Symphony Orchestra.He founded the Kioi Sinfonietta Tokyo in 1995, widely regarded as among Japan's best chamber ensembles, and has served as its music adviser, principal conductor, and honorary conductor laureate.In the UK, Otaka was principal conductor of the BBC National Orchestra of Wales from 1987 to 1995.