Ryuji, the Gun Slinger

Original title: 拳銃無頼帖　抜き射ちの竜

When Ryuji - the Gun Slinger, a drug addict leaves hospital to which he was taken after a gunfight by a notorious killer named Gin of Colt, he is employed as a bodyguard by Yo Sangen, chief of a narcotics smuggling ring.