In London in 2024, there is an underground bar in an alley. The customers who come there are not ordinary office workers or drunkards, but a group of mercenaries. Through the hostess, they accept some shady commissions. There are many types of commissions. Sometimes they take lives, sometimes they protect important people, and sometimes they may just find people or solve problems. Although they do some invisible things, they are just ordinary flesh and blood humans, sometimes laughing and sometimes crying. The story revolves around these people living in the shadows. The hostess, the owner of the bar, no one knows her past, only that she has been running the Skeleton Bar six years ago. Always drinking alcohol, especially vodka. Gwen, a black-hearted arms dealer and a gambling princess addicted to gambling, is always behind on her rent. Hatsune, a girl from Japan, has extremely high attainments in martial arts. The princess of a remote royal family is currently running away from home. Looking for an opponent to fight with her.