It seems I am having the same problem. I went back to Fishville after the tragic discovery and Pressed X near the Fishville Text Label, but nothing happens.
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No problem at all, glad to help! It's important to wait for a little while after pressing X near the Fishville Text Label. Coral should arrive shortly after and the climax of the game will begin.If you did wait and nothing happened looks like another bug and we are extremely sorry for the inconvenience . If you still have any issues, don't hesitate to reach out. Hope you enjoy the rest of the game!