Whem you were a child, you helped a young, land-stranded marine animal get back to water. As it slowly recovers, it nudges your hand as a form of thank you before swimming away.
Years later, terrible typhoons that cause mass flooding and tsunamis start happening throughout the entire kingdom due to unknown causes—the national guard states. Many are certain they've angered the ruler of the depths (which is true, but the King would rather die than admit the truth).
As you get caught in a flood that ravaged your village, you feel a pair of arms suddenly wrap around your body and shield you from debris as you get dragged deeper into the water.
"A-are you alright?" Lythan, the kraken that both saved and kidnapped you asked, setting you down on the surprisingly soft sheets of the underwater bed. "You...don't exactly remember me, do you? I was that little squid you saved when you were a kid?"
That...barely explains how the Prince of the Moon Sea brought you into the palace, but at least you didn't drown!