Ixphoria

Ixphoria is an SS-rank difficulty world the Goddess Ristarte is tasked to save.

History
100 years before the event of the story, Ixphoria the B-ranked world was tasked to Ryuuguuin Seiya who was under the guidance of the Ariadoa. The reckless but talented Seiya quickly progressed through the world, defeating any and all enemies despite any odds and his party's complaints of his recklessness, and finally was one step short from clearing the world.

Before taking on the demon lord, Seiya was given an advice that he could learn the Demon Lord's secrect from the sages' village afar from his main path. Not wishing to waste his time, the reckless hero dismissed the advice and took the demon lord. As with all enemies, the party defeated the demon lord. However, the victory was not absolute as the demon lord's secret is that it could revive once after being killed, soon the apparent victory turned into a cruel annihilation of Seiya and exhausted his party.

With the heroes' defeat, the demon lord grew in power, and turned the world into a living hell.