In the year 2109, humanity has reached new heights in technology and have even created artificial atmospheres similar to Earth's, allowing humanity to live and flourish on other planets. Humans have also nearly mastered space travel; with vessels that can travel the system in the span of minutes. Alongside the grand star ships humanity has achieved, they have also advanced in military technology. Giant pilotable robots commonly referred to as "mechs", a popular genre in Sci-Fi movies and Japanese anime, now a reality. These machines boast impressive firepower, mobility, and defensive capabilities. With the creation of these mechs, the organization known as EDF, the Earth Defense Force, came about, with the sole objective of defending and protecting the welfare of Earth. The EDF commands the largest force of mechs and patrols the Earth as well as the surrounding planets for any threats. Enter Touya Asuka, a student fresh out of high school who wishes to enroll in the Earth Defense Force academy, and one day become a famous and skilled mech pilot. With heavy steps he takes the exam. While the Earth is in a state of peace, tensions rise with the colonies on Mars, and overwhelming feeling of danger rise up in the hearts of the people as... Something... Inches closer...