Alien Executioner

Because of a meteorite 400 years ago, monsters that need to devour human flesh and blood to survive were born in the world. They are good at hiding in the crowd and spying on prey, and are called aliens. In response, the Federation established the Federal Alien Countermeasures Agency, also known as "FACA", to use the genetic cells of aliens to train excellent executives to fight against aliens. And An Ran is one of the best executives, but he always has a secret in his heart, and has another identity, as an alien "she"...