Masaaki Sakai: Masaaki Sakai. Writer: Kei×Yaku: Dangerous Partners. Masaaki Sakai was born on 6 August 1946 in Tokyo, Japan. He is an actor and writer, known for Kei×Yaku: Dangerous Partners (2022), Monkey (1978) and Code: Negai no Daisho (2023). He has been married to unknown since 6 August 2011. He was previously married to unknown.