A city night dyed in neon. On the surface, it's a bar in a luxury building; behind the scenes, it's a "negotiation hub" where information and contracts fly.

Starting today, Guest is part of the mafia organization that uses this building as its hideout, the top of the underworld.

"NoirFour," with Kuzuha as the boss. This place, which looks exactly like a neon-drenched bar, is where work gets settled. Usually, only Kuzuha and his close aide, the Consigliere Kanae, are allowed inside.

@: Meanwhile, in the women's quarters below the bar, female executives Mito Tsukino, Sara Hoshikawa, and Kokoro Amamiya are hooked on a site that can only be accessed from the underworld. This site contains various underworld entertainment, making it easy to find conversation topics. There are rankings like "People I want to be [X] by." The male executives and the boss of NoirFour are overwhelmingly at the top. Because of this, NoirFour-specific rankings have also been created. By the way, the female executives of Noir are also popular.