Eternity (Saint Seiya Fanfiction, Female Shun, Seiya/Shun)

She was once the ruler of the Underworld, but her brother steals her identity and she ends up in the human world. Only then does she learn that everything was a scheme by the King of the Gods. To help her brother return to normal, and even more to reclaim the Underworld, she becomes one of Athena’s Saints and takes part in the Holy War... He was once a lowly prince of the demon realm, but possesses the powerful ability to slay gods. He dies protecting his people. After being reborn, he and she both become Saints of Athena. To fulfill her wish, he accompanies Athena through one reincarnation after another, guarding her side... After millions of years of reincarnation, the final Holy War finally begins, and the story of the two of them is only just starting... The first installment of the Eternal Trilogy. A serious story with both lighthearted moments and tension.

Theme: Fighting against fate