The Last Story/The Vono Islands

Repairs have begun on the ship's damage, and a few of the mercenaries are interested in spending some time ashore. Speak to Dagran, who is standing at the top of the staircase. He says that Mirania and Yurick both asked him if they can go ashore, but he'll leave the final decision to you. Mirania is located in the room just in front of the ship's stern, and letting her go ashore will take you to the Mysterious Forest. Yurick is located in the room just behind the captain's quarters, and letting him go ashore will take you to the Shipwreck. You can go to them in either order, but you must complete both chapters before progressing.

If you're concerned about the difficulty, do Mysterious Forest first. The enemies you encounter including the final boss is slightly easier to deal with, as well as upgrading your experience. Shipwreck is somewhat harder, not because of the enemies, but the final boss battle involves a surprise waiting to happen. Not to spoil here so choose who you want to deal with in order for the story to continue.