In the same year, he organised the Tokyo Shin-Wagaku Consort which regularly played his own and other contemporary composers' music.
In 1985, he was invited by the IGNM - Internationale Gesellschaft für Neue Musik - and performed his "Piano Piece I" (Op.28) in Basel.
In April 1986, he returned to Switzerland where he composed and performed his "Piano Piece III" (Op.36) in Arlesheim near Basel.
In January 2008, some of Hiroaki's earlier works (Scherzo, Andante1, Adagio, Movement) were recorded by Catalan composer Llibert López Pascual.
Since he was brought up in Hokkaidō, north part of Japan where the climate was cold and hard, he seemed to have acquired a very tough and patient character.
His interests in Japanese ancient mythology and history, as found in the Kojiki and Nihon-shoki, inspired him to write "Ame-no-Uzume" (Op.4).
He left a notebook in which he was composing his new work, Opera, "The Spider's Thread" by Ryūnosuke Akutagawa when he died.