Saeko's little sister is a private eye! A passionate lady's big secret (Part One)
A new private investigation agency opens next door and it is run by Reika Nogami, Saeko Nogami's younger sister. While Ryo makes constant advances towards her, he learns about Reika's blackmail tactics against Yakuza gangsters as well as the death of her former partner. He also learns that someone has ordered a hit on Reika herself.
Aired 18/01/1988EP 41 - Saeko's little sister is a private eye! A passionate lady's big secret (Part One)
1987
City Hunter
Ryo Saeba works the streets of Tokyo as the City Hunter. He's a "sweeper" and with his sidekick Kaori Makimura, he keeps the city clean. People hire the City Hunter to solve their dangerous problems, which he does with a Colt Python. When Ryo's not working on a case, he's working on getting the ladies, and Kaori must keep him in check with her trusty 10 kg hammer.
(Source: Anime News Network)