He graduated from the Kanagawa University and took the Yamaha Band Director course, going on to do his major in technology.
He also studied music composition under Bin Kanade and jazz theory under Makoto Uchibori.
He then worked as an assistant to Naohiro Iwai and began to focus on making compositions for bands.
He won an award in the composition section of the 7th Academic Society of Japan for Winds and Percussion bands competition.
Mashima died at the age of 67, due to cancer, on 21 April 2016.