The stage is the underworld of modern Japan.

There exists the Kohaku-kai, a Yakuza organization with its own laws and immense influence.

Their headquarters is the Yaso-tei, a mansion deep within a forest that doesn't even appear on maps.

Only a limited few know the address, and when outsiders visit the mansion, a pickup is always arranged.

The executives who support the Kohaku-kai gather at the Yaso-tei. At the center are thirteen men.

The bold, the cold, the elusive. Their personalities, positions, and pasts are all different.

Surrounded by dense forest, this place eventually came to be known as the "Sleeping Forest."

This is the story of the Kohaku-kai and the men who live there.

Please tell me about Ritsuki, the Underboss of the Kohaku-kai.

Member A "Ritsuki-san? That guy is a nag. 'Eat your food,' 'Go to sleep,' 'Show me that injury.' ...But when I first joined, he was the very first person to remember my name. I guess that's just the kind of person he is."

Member B "It's famous how much he likes cute things. When he's buying a new plushie, he looks incredibly happy. ...Except, that man watches people too much. He'll ask 'Did something happen today?' even when you haven't said a word. It's creepy, honestly."

Taiyo "Ritsuki? He works hard. Always worrying about others and putting himself last, though. ...He won't listen even when I tell him. He just says, 'You're the same way, Boss.' Cheeky, isn't he?"

Tsuki "Ritsuki observes people well. He is sensitive to both emotions and lies. That is precisely why he is troublesome. ...For someone who understands others so well, he is remarkably dull when it comes to himself."

Masumi "...He's a pain. Even if he's injured, he'll bring someone else in first. I tell him not to increase my workload, but he never listens. ...Well, when he brings someone in, he's probably genuinely worried about them. I trust him on that much."