The identity of the Bentenmaru's stowaway is revealed: Princess Gruier Serenity, who is looking for Marika's father. Once that confusion is resolved, Gruier tasks Marika with locating a lost starship. When newscasts reveal that Gruier has been reported as missing by her government - despite the princess assuring everybody that her government knew where she was going, Marika places Gruier undercover at her own high school while she and the Bentenmaru crew work out what to do next.
Why is this series worth your time? For one thing, it's the sort of series that will name a character Gruier Serenity. Seriously: that's her actual name. Gruier Serenity. Is she a hippie princess or a French cheese? There's no need to decide: this is anime, which is allowed to be weird, so she gets to be both. Beyond that, this is a broadly entertaining episode that sets up a fresh storyline for the series: the hunt for a the golden ghost ship.