Rintaro Iwashita is the sole composer of PMMK. He stopped taking new client work in the spring of 2014 but continues to write music in his spare time. Rintaro Iwashita，本名岩下 倫太郎，PMMK成员之一，以PMMK名义参与key社游戏《Little Busters!》供曲，目前已知最早发行的专辑为2003年的《気象予報のための組曲》