In the early 1980s, Kotobuki joined Morio Agata's tour as a keyboard player and guitarist.
During his time with the Yukiyama Brothers, he played the keyboard on Shigeru Izumiya's tour.
Returning briefly from Cambodia in late 1993 he formed Phnonpenh MODEL, in order to join the Errors of P-Mania cover band contest - a contest for P-Model cover bands held for three years.
[2] Originally formed as a joke, the band has continued sporadically to this day and have released three studio albums and live CDs from their shows in Paris, Berlin and Tokyo.
Key members are Hikaru Kotobuki, Lion Merry (ex-Yapoos and Metrofarce) and Masaaki Taniguchi.