She always steals her targeted treasures. That is the Phantom Thief Queen! Her gender, age, and nationality are unknown. Together with her partners Joker and RD, she freely travels the world aboard the airship Torvador. One day, Queen is challenged by Satchmo Wilson, the president of Satchmo Corporation. A notice arrives from Queen stating she will steal the 'Imperial Sapphire,' a gem owned by Satchmo. However, this is a trap set by Satchmo to settle a grudge against Queen stemming from a past feud. Fully aware of this, Queen takes Satchmo's bait and, disguised alongside Joker, boards the luxury cruise ship Royal Satchmo. To enjoy an 'elegant vacation'... However, someone appears who aims to steal the gem before Queen and her team! Furthermore, assassins sent by Satchmo begin to appear one after another...?! A perilous Caribbean cruise begins. Even so, nothing is impossible for the Phantom Thief Queen!