Natsu Dragneel is one of the very best spies in the world. He's assigned to work with Lisanna Strauss. However, when they come across a difficult battle, they don't know who it is. This individual happened to be very skilled too. Lisanna gave up and went home while Natsu stayed there and battled the mysterious person. Lisanna didn't know what was in over her head. As soon as Natsu was defeated, the individual showed Natsu's unconcious body to Lisanna. Now Lisanna was sure she knew who it was.