The distant future, the vast universe. Weak but tenacious human beings are organized together. I provided them with the power to ascend the dimension, but they started a war. As one of the fifteen generals, I also joined the war.
Another version: I am a scientist and I am working on something called a dimensionality enhancer. Because human civilization did not have enough resources, they went to war with other civilizations. I also joined the war.
Supplement: The early production of the dimension-enhancing device was only to advance the plot and was not the main content. This article is mainly about interstellar warfare.
Concept: Fantasy for the future