Women who work as OL and teachers by day, work at the girls bar "W Lounge" at night. The "W Lounge" is also a private detective agency. The women at "W Lounge" fight against enemies of all women.
Tsubomi’s friend Airi disappears, leaving behind a debt of 3 million yen which Tsubomi co-guaranteed. To pay off her friend's debt, Tsubomi begins to work at the bar "W Lounge." Manager Mona and the other women at “W Lounge” listen to Tsubomi’s story. They begin to investigate the case and soon receive information that Airi at a secret club.