S. Kajiya, an alias of composer Ryuichi Nitta, is a notable figure in the video game music industry. He contributed as a sound director and composer for the 1990 release "Ninja Gaiden II: The Dark Sword of Chaos" and provided sound effects and music for the 1995 game "Battle Pinball." Nitta also founded Kajiya Music Co., Ltd., a music production and artist management company that operated from 2000 until its closure in 2020. ([vgmdb.net](https://vgmdb.net/artist/54130?utm_source=openai))