Encountered by Tadashi Daiba on the Rainbow Planet, Shiraku presents herself as one of a band of civilian refugees who has fled the Mazone caravan. She promises to give certain information as to the whereabouts of the kidnapped Mayu in exchange for Harlock's protection, but Shiraku is in truth a no-good lying snake-in-the-grass, which Harlock, though not Tadashi, suspects right from the start. Her plot to kill Harlock fails, though just barely, and she has the double pleasure of being shot by both Harlock and Tadashi.