Laura is from the land of mermaids known as Grand Ocean. She is the same age as Manatsu and Sango. She's very self confident, and is the type of person who will honestly say whatever is on her mind. In order to become the next queen of Grand Ocean, Laura searches for the "legendary warriors, Pretty Cure" . She comes to the surface to live with Manatsu and the others so she can support them.
As time passes, Laura begins to spend more time with her human friends, but her wish of wanting to become a human grows stronger. Her friends also find her acting strangely, and Minori is the first one to figure out that she wants to become human, and tells Laura that she has to give up something precious in order to fulfill a wish. After meeting Natsuumi Aoi, her eagerness to become human grows, but she wonders what Minori meant.
The next day, when the Cures are fighting Chongire’s Zenzen Yaraneeda, Laura tries to retrieve the Motivation Power from it, but the monster dumps a bunch of similar-looking bottles on her, swapping the Mermaid Aqua Pot out for one of them. As she desperately searches for it, she is captured in a net and the Zenzen Yaraneeda escapes with her. Laura is taken to the Witch of Delays and refuses to say anything to her, but the Witch figures out Laura's desire to turn human and begins convincing her to work for her so she will grant her wish. TRPC16 When Laura refuses to be tempted by the Witch, the Witch decides to send her to the dungeon.
After failing to escape from the dungeon, Laura is discouraged until she recalls memories with her friends. She decides to retrieve the Mermaid Aqua Pot by herself. She is caught by the Witch's grasp when she accidentally wakes up the Witch, but escapes with the Pot after biting the Witch's hands. After being rescued by Kururun when she is attacked by Butler, she meets up with the Mermaid Queen who asks her what does she really want to do next, and she decides to return to her friends. The Queen is delighted to hear her decision and hands her a pact.
On her way however, Laura realizes that her friends are in trouble when she sees how Chongire has easily defeated Summer. Determined to rescue her friends, she tells Chongire that she won't allow anyone to injure her friends, thus gaining her Heart Kuru Ring and the pact becomes her Mermaid Aqua Pact, which allows her to transform into Cure La Mer for the first time.
After retrieving the Motivation Power and purifying one of the Zenzen Yaraneeda, Laura is reunited with her friends, and is overjoyed when she realizes that she has gotten legs and thus has become a human as she wished. She later decides to stay at Manatsu and Aoi's home and attend Aozora Middle School, much to Manatsu's joy.
