We made a mistake, and the universe is dying.

Humanity left Earth and headed into space in search of resources.
Science has made remarkable progress and brought about the commercialization of teleportation and cyborgs,

and humanity enjoyed an unprecedented golden age.
 

However, resource depletion, overpopulation, famine... and again, class division occurred.
The longer human lives, the resistance against change grew larger, and wealth and power concentrated to few.
The fight to protect or take continued.
 

The conflict between the World Government and the Cartel soon led to war,

throwing the entire universe into a nightmare.
 

Then, the 'Silence of Stars' happened.
The war ended when all the spaceships crashed at once for an unknown reason.
Bitter, where the spaceship crashed, was once a pioneer planet known as a utopia and hope for immigrants.
Bitter was struck by a tremendous aftershock and fell into silence, annihilated.
 

And 45 years have passed since the end of the war.
There are people who seek for a future on a ruined planet.