Description: Become an EDF Soldier and Save Earth. Become one of the soldiers of EDF and exterminate the invading aliens. Protect peace on Earth. Human-Looking Aliens Appear for the First Time in The Series What are the unprecedented and intellectual alien beings from another planet called the 'Primer'? A series-first enemy alien finally appears. The battle with this intelligent enemy produces unprecedented deep despair, while leading the player to the most fun yet as EDF must confront them with courage and wisdom.