Futaba is just an average girl. But her father was actually the boss of a big group called Fly Call (she didn't know). One day, when she comes back home, she finds her house being such a mess. Also, her mother is gone... When she is at a loss what to do, a group of men suddenly appear and try to abduct Futaba. She does not know who they are, but Reimei and Shirou appear and save her. Reimei and Shirou are the bodyguards served under her father. Reimei askes her to be the next boss of the Fly Call. She also hears that her father lost his life when she was a kid. Since she can not believe it, she refuses his offer. But she knows that the missing of her mother is related to his father group, so she decides to stay at her father house. Well, will she be able to save her mother...?