The Year is 2103, Earth has expanded its territories to many parts of our solar system however everything change in 2084 when a exploratory ship found signs of alien life in the Alpha Centauri System. These aliens were named The Centauri Empire by the nations of earth since destroyed the exploratory ship and soon the United Nations of Earth declared war on these aliens. Nearly twenty years of fighting had passed the war continues with heavy casualties, we follow Ren, a young promising trainee to pilot Earth's best defensive weapons, The Sentinels. These machines were the only defense against the Centauri's Empire's own weapons, The Centurions. How will Ren fight against the Empire and what happens when he meets one of the bewitching princesses of the Empire who turns out to be a Yandere.