In the underwater world of unicorn mermaids, magic is everywhere! But only if you know where to look. And no one searches harder than the unicorn mermaid named Luck. More than anything else, she would like to discover a piece of magic in herself that will set her apart from others and emphasize her individuality. And Luck finds a chest in the sea forest filled to the brim with shining shells and a mysterious note “Share the magic.” But how can she share what she doesn’t have?..