Mysterious monsters appear as Naofumi is preparing for the next Wave. At the same time they show up, the Wave countdown stops. The Queen summons the Four Cardinal Heroes, and tells them that the Spirit Tortoise has revived.
The leaders of all the nations' militaries gather in the Spirit Tortoise Kingdom. Naofumi is there as well, and promises to offer his help as one of the heroes. But just before they decide on a plan, a mysterious woman appears.
The Spirit Tortoise begins its march once more appearing at the border of the kingdom. Naofumi volunteers to lure away its familiars while the army tries to bring it to the mountains.
The Spirit Tortoise begins its march once more, appearing at the border of the kingdom bearing its name. Naofumi volunteers to lure away its familiars while the army tries to bring it to the mountains.
Naofumi is met by L'Arc, Glass, and Therese. They're after the person who broke the Spirit Tortoise's seal and is controlling it. L'Arc proposes teaming up again.
A unexpected mastermind appears who had been pulling the strings behind the Spirit Turtle, as the truth of Ost Hourai is finally revealed, and Naofumi faces a heavy dilemma.
Naofumi wakes up in a strange prison to find him and his party at level 1, and Filo missing. They start to raise their levels in order to escape, but things quickly turn against them when a dangerous monster suddenly appears.
Naofumi's party heads for the Dragon Hourglass of Mikakage, in order to get to Sikul, the country that summoned Kizuna. Along the way, he sells rare healing items to make a hefty profit. He hears a rumor about a genius mage.
Raphtalia is imprisoned in a Raybul Kingdom prison. She's wary of L'Arc's team, who is also imprisoned there, but asks them for help in escaping. Glass is weakened by the draining power of the prison.
Naofumi's party is overjoyed to be reunited with Raphtalia. Kizuna criticizes Glass for invading another world. Glass and L'Arc swear they won't fight Naofumi anymore, and instead find another way to solve their problem.