Awakening from a Future Eroded by Starlight

The first mechanical war destroyed human civilization. Immediately afterwards, the star beast arrived, triggering another war. Human civilization is almost in ruins. The story takes place in the year 201 of the Mechanical Era. Human civilization is gradually rebuilt from the ruins. It was an ancient spaceship that had been floating for more than 200 years. It was said that it had high technology that could not be matched by modern times. The spaceship is named - Alt Ark