Oikawa Tooru was the sun God Apollo and he didn't want to have any kind of relationship with humans, after seeing what happens to a God when the said human dies. But the universe has another plan for the God. Ushijima Wakatoshi was a warrior, he would fight for his kingdom but also for his God, that would never change. Besides that his life was simple and Ushijima thought it wouldn't change, but he was completely wrong.