The Heart-to-Hearts at Eryth Sea will not all be available to you as soon as you reach the area. Some of them will not unlock until much later into the story quest, or until you have met new people and developed certain affinities with them. These Heart-to-Hearts give affinity boosts depending on the answers you give during cut scenes. If you choose the optimal answers then you will get the maximum amount of affinity that the cut scene gives out.
Riki and Fiora: Riki have question
|Syrath Lighthouse||Green Affinity||--|
- What is it, Riki?
- You do? Wow!
Sharla and Dunban: A Gift for a Loved One
|Ether Plant||Green Affinity||After the Events at Galahad Fortress|
- I-I'd love to, thank you...
- But the thought is still nice.
Riki and Sharla: Flowers of Eryth Sea
|Hovering Reef 2||Green Affinity||--|
- I like flowers too.
- She'd be so happy!
Riki and Reyn: Fish Fly! Fish Fly!
|Sleeping Dragon Isle||Green Affinity||--|
- But Riki just see one!
- Riki want five for himself!