The Bentenmaru crew are introduced to Princess Gruier Serenity, who asks them to find the Golden Ghost Ship.
Gruier transfers into Hakuoh Academy.
The Bentenmaru goes to meet an unknown ship entering the Tau Ceti system and finds a damaged Serenity Corback, pursued by several other Serenity ships.
"The third planet in the Tau Ceti system, Sea of the Morning Star. As with most newly settled planets, once generations passed, and its population increased, relations with its overseer, the Stellar Alliance, worsened. And a war of independence began. To complement their meager fleet, the government of the Sea of the Morning Star issued Letters of Marque. And legal space pirates were born. Over a hundred years have passed since the war's end, and this is a story of pirates sailing the seas of space."
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"Multiple factions within the royal palace. As the princess struggles against them alone, the girl offers her hand. What is the golden ghost ship that holds the key to ending the struggle? Destiny leads the girl into wider seas. Next time, on Mouretsu Pirates: A Beautiful Launch. Look forward to it."