Diluc has been able to see the starry sky in Kaia's eyes since he was a child, and Kaia will always be close to Diluc, the source of heat, unconsciously. The friendship, family affection, and love intertwined among them are like winding vines, tightly wrapping and entwining them, and finally blooming into bright flowers of ice and fire. "Our friendship is everything to me." They desperately absorbed emotions from each other, but they never thought that each other would be deeply engraved in their bones, blood, and even hearts.
Purpose: Our friendship is everything to me