Shinkichi Mitsumune was born in Fukuoka City, Fukuoka on October 8, 1963 and graduated from Rikkyo University, College of Economics. From the young age of four, he attended the Yamaha Music School and received acoustic training. He started playing the electronic organ at the age of 10 and received tuition from Koichi Oki - a jazz organist while still in junior high school. While at university, he started playing the keyboard for professional bands following which he joined the band of jazz vocalist, Marlene, and toured various jazz festivals across Japan for about two years.

In 1995, he worked on his first anime soundtrack °…Nurse Angel Ririka SOS°… in which the profound, high-quality and soothing composition performed with a full orchestra garnered high acclaim. This performance was followed by a string of hit anime soundtracks including °»Revoluntionary Girl Utena°… (1997), °»Yu-Gi-Oh! Duel Monsters°… (2000-2004), The series °»Rozen Maiden°… (2004-2013), °»Negima! : Magister Negi Magi°… (2005), The Series °»Zero no Tsukaima°… (2006-2012) and °»Yu-Gi-Oh! VRAINS°… (2017-2019)