Biography
Koji Kasamatsu is a sound professional active in the film industry, contributing to multiple productions in various sound-related roles. Their work spans sound effects, mixing, direction, and supervision across animated and live-action projects. In 2008, Kasamatsu worked on sound effects for the film Ponyo. By 2011, they served as a sound mixer for From Up on Poppy Hill. Their involvement in sound direction began with Mary and The Witch's Flower in 2017. The scope of their work expanded to include Mobile Suit Gundam Hathaway in 2021, where they held the role of sound director.
Kasamatsu continued as sound director for The Summer Hikaru Died, a 2025 release. They also directed sound for ALL YOU NEED IS KILL in 2026. That same year, Kasamatsu directed sound for Mobile Suit Gundam Hathaway: …
