She is the Xyz dimensional counterpart to Yuzu Hiragi (Standard Dimension), Selena (Fusion Dimension), and Rin (Synchro Dimension). According to Leo Akaba, Ruri is crucial to his plans just like for the other three dimensional counterparts of Ruri.
Before the invasion of Heartland, Ruri watched Dennis Macfield performing card tricks in the park. Noticed by the performer, she was quickly picked up by "Entermage Trapeze Magician" and deposited in front of Dennis, who knelt to her in a princely manner and requested a Duel. Indirectly, Ruri was the cause of the invasion as Dennis green-lit the invasion the moment he found her. After the invasion, Ruri was queuing up to draw water when she met Dennis again, this time accompanied by Yuri. She was pursued by Yuuri, beginning a Duel with him when she was cornered against the ruins. Ruri lost the Duel and was captured and brought back to Duel Academy.