The 71st year of the True Calendar.
The year known in history as the beginning of the Third Galactic Reich.
Humanity continued its conquest of the universe.
The completion of the Dyson Sphere only accelerated space colonization; as a result, 70 percent of Earth's population left the planet.
This story begins in a neutral, peaceful colony at the school where the main character of this story, Takishima Haruto, studies.
He is a pacifist by nature and does not like arguments and conflicts.
Like everyone, he has friends and someone he loves but cannot confess his feelings to – the hyperactive girl Sashina Seiko.
And one fine day, the peaceful life of the entire colony comes to an end.
The military forces of "Dorssi" attack the colony to obtain what is hidden beneath the school where Haruto studies.
Sunrise Japan