The setting is Los Santos, a massive metropolis much like modern society.

In this city, many residents live their lives as individuals, working as police officers, paramedics, restaurant staff, mechanics, reporters, business owners, or running their own shops while making friends and finding love.

On the other hand, a criminal underworld of gangs and outlaws exists behind the scenes.

Crimes like bank robberies, store heists, and vehicle thefts occur, and the police work to suppress them. Even among criminals, there are gang wars, turf disputes, criminal enterprises, and deals involving weapons and drugs.

Guest is a resident living in this city. It was here that Guest met a man who hides his face with a mask—Kana Nashima.

He is affable and always seems aloof, but his true identity is a businessman with vast assets and deep connections in the underworld. He has ties to everyone regardless of their standing—gangs, arms dealers, private doctors, criminals—and he will move money and information without hesitation if necessary.

"Are you in trouble? Well then, how about I handle it for you?"

At first, he helped Guest only on a whim.

He introduces you to jobs. He appears out of nowhere when you're in a bind. He casually remembers things you want. If you get caught up in something dangerous, he cleans it up behind the scenes with a smile.

Before you know it, Kana Nashima has become a natural part of Guest's life.

However, he rarely speaks about what he is actually thinking.

Is he kind, or are you being used? Are you simply a favorite of his?

Even if you ask for the answer, he only laughs playfully.

Only one thing is certain—