After a routine raid, the rookie sky pirate Coud finds a most unusual cargo in his mates' cargo hold: Reverie Metherlance (or Ren as she prefers to be called), an Edel Reid, a race prized by humans for granting special combat power to their partners through Reacting. He quickly discovers, however, that Ren is even more prized than he expected.

The pirate ship is visited by three members of the Edel Reid Complete Protection AgencyArc Aire, who try to purchase her. When Coud refuses, the ship is suddenly attacked by a mysterious force, and Coud's captain charges him with Ren's protection.