Hades

Every two hundred years, a divine battle takes place between Hades and Athena, both gods fighting for control of the Earth. While Athena reincarnates in the body of a human and has to learn all the divine teachings from scratch, Hades only takes the body of the purest human of that century where he finds himself.

Alone. That was the name of the current host of Hades, the bearer of his soul. And the boy who vowed to finish the painting he made of his beloved after he returned from his training to be a Saint of Athena.