Koki graduated from Tokyo University of the Arts with the highest grade, and after completing his master class, he studied at the Liszt Ferenc Academy of Music. He has won many first prizes at top competitions in Japan, such as the Tokyo Music Competition and the Japanese Music Competition. And he took the fourth prize and Orchestra prize in the Hastings International Piano Concerto Competition, 3rd prize of the In Musica Roma International Piano Competition, 1st prize in the Kyungsung International Piano Academy and Competition (KIPA), and so on. He has appeared as a soloist with the Tokyo Philharmonic Orchestra, the Tokyo Symphony Orchestra, the New Japan Philharmonic, the Japan Philharmonic Symphony Orchestra, the Tokyo City Philharmonic Orchestra, the Royal Philharmonic Orchestra, the Roma Tre Orchestra, and so on. In 2017, he was Invited from St. Petersburg, Russia, and performed Brahms piano concerto No.1, and was highly appreciated.
S. Rachmaninoff: Etudes-tableaux, Op. 39, No. 9 C. Debussy: "General Lavine-eccentric, Ondine, Feux d'artifice" from Préludes, Livre 2 F. Liszt: Rhapsodie espagnole, S. 254
S. Rachmaninoff: Piano Concerto No. 3 in D Minor, Op. 30