Baldr Fist

...Once, the human society that evolved its civilization to the extreme of it's peak. However, at some point, it followed the path of slow decline, and by the time the 30th century was counted, it was about 1000 years ago. It had retreated to the same extent. Except for the fact that working robots called "GIGAS" supports all aspects of people's lives, they are living at the same level as they are today. Story takes place two years before "Baldrhead ~Busou Kin'yuu Gaiden~"