illuminating dust from the past / ruikasa

Two inseparable angels; Rui and Tsukasa, the princes of the most dominant kingdoms, were always perceived together. One day, an incident forces them to be set apart and go against another; war. By then, the two were completely different during the incident. What shall they do when they cross paths again, almost as if it was destined?

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I update this every 2 days to a week , unless I have no ideas.