Rani, a two-hundred-year-old mermaid is reunited with her long-lost friend, a mortal man named Tristan after 10 years of separation. Having enough of loneliness, Rani seeks Tristan's returning companionship. Unwillingly taken away from their friendship, Tristan once again finds comfort in Rani's wisdom and calm.

However, evil has followed Tristan home and the coast of Kuala Selangor is no longer safe for Ran like it was a decade ago.

What will they do to protect each other?