Koichi Yagi - is a video game writer. Koichi Yagi began his career in 1999 and has worked for companies such as Konami Computer Entertainment Kobe and Konami. Koichi Yagi's first game was Castlevania: Legacy of Darkness which was released 24 years ago. Best Game Koichi Yagi contributed to was Castlevania: Legacy of Darkness. Koichi Yagi's latest work is Castlevania: Legacy of Darkness which was released 24 years ago.