The ship was used Selene during her career as a famous pirate. However, 50 years prior, she and her crew met her demise upon opening a treasure known as the Calamity Box, which housed the Beelzebubs, powerful monsters who threatened to take over the world. Before she perished, Selene used another treasure, the Jewel of The Rotten World, to create a barrier that kept the unsealed monsters at bay. One specific treasure also remained on the ship: the Purple Orb. The ship is stationed west of Gold Port, about a week of traveling distance. Because Selene was full of guilt for accidentally releasing the evil monsters, she could not move on and her ghost resides in Gold Port, under the alias of Selene's granddaughter Selena, in search of someone who could defeat the Beelzebubs and liberate her spirit.
Eventually Selene (currently pretending to be her fictional granddaughter Selena) finds Luka and Alice, who are searching for the Purple Orb in order to awake the Garuda Girl, and enlists their help. When they arrive at the ship, Alice senses the barrier put up and tells Luka that it isn't to keep people out, but to keep something in. Selene explains to them what she did to keep the evil in, and Luka is suspicious of how much she knows. Their conversation is then interrupted by Starfish Girl, who accidentally wandered into the barrier and was unable to escape.
Inside the ship, Alice discovers that Selene is a ghost, but is too frightened to tell Luka. Selene tells Luka that the Calamity Box is in the captain's cabin, reveals that it housed a monster, and tells him he must stop it before mysteriously vanishing. Luka drags Alice to the cabin and finds the three Beelzebubs waiting for him, and Alice explains their origin. Luka fights them first while Alice recovers from her fear. When he defeats the first Beelzebub, the remaining two decide to fight seriously. Alice then steps in and fights alongside Luka, and kills the other two monsters.
With the issue dealt with, Luka claims the Purple Orb and leaves the ship, where Selene reveals her true identity and thanks him before she and her crew vanish. The ship they came on magically sails back to Gold Port on its own, as if it were controlled by Selene's invisible power.