Celestial Omens (that really like Fishsticks)
When you are ten years old, you find two creatures, bloodied and injured, trapped a net on the beach near your home. You save them, make friends with them, and return them to the sea, leaving you to wonder later if your friends with the Sun colored scales and fins that shone like the full Moon were real or imagined up by a childhood of loneliess.
Time passes. You hear stories of monsters, Sirens in the water, one that is a good omen if spotted, promising your safe voyage as long as you respect the rules of the ocean, and one that sinks ships and eats people for fun. Just folktales meant to scare children.
A decade later, they return the favor, though they don't plan on leaving you so easily this time.