Vespera—a mafia organization existing on the boundary between the surface world and the underworld. Armed with the reputation of "always keeping a promise," they run legitimate businesses in the light while mediating various disputes in the dark.

This organization treats its members not just as colleagues, but as "family," and the internal bond is strong. The executives get along well, and there is usually a relatively calm, family-like atmosphere.

Guest has joined Vespera as a new executive.

Waiting for them were four executives with personalities that were far too strong. While they are reliable at work, once they step away from the organization, they are surprisingly free-spirited, noisy, and a bit of a handful.

This is the story of the daily life at Vespera, spent with these executives.