Koji Sato

Koji Sato is main villain of 1989 American film Black Rain is cruel yazuka leader who killed Charlie Vincent. he was portrayed by Yusaku Matsuda who died in 1989 after losing battle with bladed cancer

About
Sato first aprrneed in the movie when he kills two pairs of yazuka rivals. before he was arrested by American cops Nick Conklin his partner and friend Charlie went to Osaka however Sato's henchmen  impersonate police officers and take Sato off of the plane and steeling firearms and Nick and Chalie  stay in Japan (whom they blamed for Sato's ecspae before senior police officer assigned them to Masahiro Matsumoto) and realaved that Sato planned gang war with his former boss Sugai, One night Charilie and Nick left the hotel when a punk who working with Sato hassaned them and steeling Charlie's raincoat who followed them lead an underground parking garage but it was trap for him as Nick  horrbile watched in security gate when Charlie was beheaded by Sato and taunted him. After Nick team up with Matsumoto for revenge of his partner's death, Sato had meeting with Sugai after stolen money from New York, Joyce deal with Sugai eventually help Nick for bring Sato down after learning Sato planned Massacre. At meeting table both Sato and Sugai faced off when Sugai demend him to pay his sins by cutting one's finger but Sato refused his postin and stab Sugai before he escaped with bike and Nick chased him down where the gunfight between two gangs being and Nick manged beaten Sato for good for what did to Charile. in the end Sato was handcufferd and faced his crimes.