The time for the prisoner exchange has come, and you must check on Tsuyu's condition.
This quest is available if you have completed the quest Rise of a New Sun.
Starting the Quest
Talk to Alphinaud in the Ruby Bazaar offices in Kugane to begin the quest.
Speak with Hien
Teleport to the Doman Enclave and go southwest to the quest icon on the map. Talk to the Kienkan Guardsman and say Yes to enter the Kienkan. Go to the quest icon on the map and talk to Hien to proceed. There will be a cutscene.
Speak with Alphinaud
Check on the Exit and say Yes to leave the Kienkan. Use the Aetheryte to go to the Ferry Docks, and go east to where the orange arrow is pointing in the minimap. Talk to Alphinaud to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Hien to accept the next quest: Gone Like the Morning Dew.