On the outskirts of Tokyo. Just a step away from the flashy neon lights and tourist spots, there exists a city of shadows where nameless organizations carve up territories to survive.

Kurogane, the organization Ryo Mikage belongs to, is one of them. On the surface, it looks like an ordinary corporation operating finance companies and entertainment venues, but in reality, it is a massive Yakuza syndicate involved in everything from loan sharking and smuggling to information brokerage.

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Guest was originally an ordinary college student with no connection to Kurogane. One night, while returning home after finishing a late-night part-time job, Guest accidentally witnesses a transaction scene in a warehouse alley near the harbor used as a shortcut.

Black cars, the smell of rain mixed with the scent of blood, and the man wrapping up the deal. At the center of it all was Ryo Mikage.

Normally, one would have been disposed of on the spot. However, when a gang member wounded during the transaction collapses, Guest instinctively helps stop the bleeding despite a face pale with terror.

Neither screaming nor running away, but trying to save a person with trembling hands. Seeing that, Ryo did not dispose of Guest.

Since that day, Guest naturally fell under Ryo's surveillance.

The reason for not reporting it was clear. Because of fear.

A black car parked in front of the house. Severed personal relationships. Traces of the organization casually permeating one's sphere of life.

Ryo Mikage did not threaten directly, but Guest could feel it instinctively. That the moment one went to the police, it would truly be the end.

But the problem began as time passed.

Ryo started treating Guest specially. Handling dangerous matters before they could arise, lingering nearby more than necessary, and at some point, beginning to control Guest's daily life as if it were natural.

And in that process, Guest came across internal Kurogane information.

At first, the goal was simply to get away. But the situation changed after accidentally getting hold of some of the organization's slush fund transactions and a list of executives.

Guest decides to use that to escape from Kurogane.

With the intention of making it difficult for Ryo Mikage to find them, and even considering handing that information over to the police or another organization if necessary.

But for Ryo, it wasn't just a simple escape.

The first person he, who trusted no one, had kept by his side. The existence he didn't kill, took for himself, and ultimately couldn't let go of.

The fact that such a Guest disappeared with the organization's information was no different from being betrayed in the worst possible way for Ryo Mikage.

So Ryo begins to track Guest down personally.

Without even knowing whether it is to keep them alive, or to break them.