Available: After Azura marries any character
Unlockable Character: Shigure
The battlefield consists of three ships so flying units is recommended since the positions of the ships will change almost every turn. Fliers will give you the mobility to move between ships with ease. Shigure will not take part of the battle and will only become available after successfully completing the mission. At the start of the first turn, northern ship will broadside your ship. Avoid moving your troops too far ahead or they'll get separated. At the end of the first turn, the northern ship will detach and your be broadsided from the south. This cycle will repeat for the rest of the battle. You can focus on one ship and move the bulk of your forces there to quickly eliminate the enemies. Make sure to move your units only when they're near each other; otherwise, you won't be able to board them all properly, rendering your advance units vulnerable.
Two berserker units will arrive as reinforcements later on the southern ship but your only objective is to defeat the Adventurer boss on the northern ship. You can prolong the battle as long as you don't aggro the boss. Otherwise, defeat him to end the battle immediately.