This page of our guide to Ghost of Tsushima has a walkthrough for the Lost at Sea quest.
How to unlock: Speak with the woman at the Golden Temple.
Where to start: Kijo Island.
There's a man waiting for you on the island. You need to talk to him to hear the story about his daughter.
When you get to the destination, you must quietly eliminate the Mongols. This will make your task a lot easier. When you get rid of the opponents, go to the lower deck and free the girl. Once you help her get out of the enemy ship, you will complete the task.
- Legend increased - smaller bonus;
- Lesser charm of defense;
- +4 Leather.