Forgotten Hero in the System Apocalypse

After the fight with the Demon King was followed by a deadly encounter with the Abyss, Amelia sacrificed herself in order to give her friends time to escape this new foe. An Overseer of the System, who was in charge of preparing planets for its future arrival, called for a quarantine, not wanting the Abyss to gain a new foothold in the material universe. The mana of the planet was removed, the memory of its inhabitants changed, and history itself was rewritten. Forgotten and left trapped fighting for over a thousand years, Amelia is eventually freed, only to enter into an alien world that doesn't remember her. It didn't help that said world was also in the middle of the apocalypse, thanks to the full arrival of the System.