Masafumi Mima is currently serving as the president of Techno Sound, a company that specializes in sound production. He began working at this organization in 1997 and has held his current position since 2004. Prior to joining Techno Sound, Mima worked part-time at Nippon Cultural Broadcasting, where he assisted with the creation of radio dramas during his time as a student. After completing his studies in 1984, he went on to work as an apprentice under sound director Susumu Aketagawa at Magic Capsule. Mima remained with this company for 12 years before leaving and becoming a freelance agent. His first project as a sound director was the 1988 OVA Madonna Honoo no Teacher.