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Yuta was a member of the Tralesta clan of the Acamarian people, who were beset by clan warfare. She was one of five who survived a massacre by the Lornak clan and was chosen as her clan's instrument of vengeance. She was implanted with a genetically engineered virus which would kill any Lornak she touched, making it look like heart failure. She was also engineered so her ageing process was slowed, allowing her to remain youthful for decades as she slowly hunted down all the Lornaks. One of those she killed was Penthor-Mul, a Gatherer she killed while he was awaiting trial.
In order to be better placed to find the Gatherer renegades where the remaining Lornaks were, Yuta took a job as the chef and food taster to the Acamarian sovereign Marouk. Her opening came when the Enterprise convinced Marouk to meet with the Gatherers, whose raids were threatening the Federation, and negotiate for them to return home. While their leaders conversed, Yuta took an elderly Gatherer from the Lornak clan, Volnoth, to one side and infected him with the virus, killing him.
Yuta prepared a meal for Commander Riker at his request. Riker was attracted to her and Yuta may have reciprocated but the fact she could only view a liaison in terms of being a servant made him uncomfortable. Yuta's final target was the Gatherer leader Chorgan. She attended his talks with Marouk, but before she could kill him, Riker arrived, having worked out who she was with the crew's help. He tried to convince her to stand down but Yuta lunged for Marouk, trying to touch and infect him. Riker shot her repeatedly, vapourising her.