Kei is the Arcadia's chief navigator and science officer, and she's generally the second-youngest crew member. Not much is known about her exact age or background, though her backstory involves being rescued by Harlock during a raid on a transport ship—she'd been taken prisoner after attacking a military officer, driven to it after he insulted her father's memory.
When Tadashi joined the crew, Kei was already established as a trusted member. She seemed to develop feelings for him at first, though they eventually settled into a solid friendship. Later versions of her character lean differently, portraying her with romantic feelings toward Harlock instead. She's a capable officer with a reputation for competence in her dual role on the ship.
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