I'm a Bodyguard(1964)

Kita Ippei (Atsumi Kiyoshi) became a security officer in the Metropolitan Police Department's Security Division after catching a thug who attacked a writer living in the area while working at a police box. His dream is to become a bodyguard (BG) for the Prime Minister, just like his senior, Detective Inspector Takagi (Ryu Chishu). Kita Ippei is very successful in both work and love, getting attacked while guarding a female minister, getting some perks as a BG for a foreign princess, and becoming friends with a woman at his favorite bar.