Reika Nogami is the sister of [Saeko](https://anilist.co/character/2069). In one of the episodes, she opened a detective agency near [Ryou](https://anilist.co/character/2065) and [Kaori](https://anilist.co/character/2066/Kaori-Makimura)'s house. She is a supporting character in several episodes.

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)

Ryo Saeba is a "sweeper" in the city of Tokyo. His works as a trouble shooter, cleaning the streets of vermin, and helping out desperate people. Sometimes he's a bodyguard, sometimes he's an assassin, whatever Ryo does he does it well. In fact his only flaw is his hormones - he loves the ladies and sometimes turns into an idiot when he's near them. Thankfully he's got people like his sidekick Kaori Makimura to keep him in check. 
 
(Source: Anime News Network)

Ryo Saeba is a "sweeper" know as the City Hunter. He and his sidekick Kaori Makimura are hired to solve problems that the police can't (or won't) handle. When he's not keeping the streets of Tokyo clean, Ryo is chasing the ladies, and Kaori chases after him with a giant anti-ecchi hammer.
 
(Source: Anime News Network)

Ryou Saeba and his long-suffering partner Kaori are out to make the streets of Shinjuku safe for the weak, the poor, the down- trodden, the... Well, actually, Ryou’s just hoping for a little mokkori from a grateful client. And Kaori’s just hoping her 100-ton hammer is big enough to get Ryou’s mind off the girls and on his job. With a bevy of beautiful women and a host of dastardly villains hanging around, City Hunter’s got to be ready for any kind of action! 
 
(Source: Discotek)

A beautiful pianist comes to Tokyo for a charity concert, and City Hunter is there. But music isn`t his forte; he wants lessons in the language of love. Desperation becomes the word of the day as the bodies start dropping. A foreign dignitary is assassinated in cold blood. Secret agents scour the streets for a missing microchip. Diplomatic infighting swirls around the upcoming concert, and City Hunter is the only hope! 
(Source: AnimeNfo)