1Drifting Island for koto (17-chord) and percussion op.38 (1979)
2Two Fantasies for 20-stringed koto & 17-stringed koto I. (1969)
3Two Fantasies for 20-stringed koto & 17-stringed koto II. (1969)
4Isurugi for solo 17-stringed koto (1974)
5Isurugi for solo 17-stringed koto (1974)
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