City Hunters Season 1 Part 1 contains episodes 1-26 of the anime directed by Kenji Kodama.

This "sweeper" keeps the scum off the streets of Shinjuku...

Ryo Saeba, the legendary City Hunter, is a first-class sweeper for hire, taking on jobs from protecting beautiful women to taking out bad guys permanently. He can be a private detective or hitman, whatever the case calls for, and it often requires the use of his superhuman marksmanship.

But even so, Ryo can't do it alone. His partner is Kaori Makimura the younger sister of his murdered best friend. Kaori serves as his assistant, while also protecting their attractive clients from Ryo's "mokkori" advances with her trusty supply of 100 ton hammers. Though they always appear to be at each other's throats, the partners trust each other implicitly when the chips are down, and together they've solved various tough cases.