Ixphoria

Ixphoria is an SS-rank difficulty world. It was formerly B-ranked, but due to Seiya Ryuuguuin's failure in his past conquest, it had been taken over by its Demon Lord.

As part of Ristarte's punishments, she was tasked to save this world.

History
100 years before the event of the story, Ixphoria was tasked to Ryuuguuin Seiya, 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. However, Seiya refused to hear the Demon Lord's secret from the sage's village, and directly headed to face the Demon Lord.

As with all enemies, Seiya managed to defeat the Demon Lord, and his teammates were exhausted after the victory. The Demon Lord, however, revived as part of its secret, and soon the apparent victory turned into a brutal annihilation of Seiya and his team.