A purple-haired LRIG from the Lostorage conflated WIXOSS narrative, Aya originates from Shou Narumi's memories of his younger sister, Aya Narumi. She serves as Shou's LRIG in the Selector Battles. Her personality shows a distinct duality: outwardly sweet and innocent, yet revealing a harsh, easily irritated side when challenged or frustrated, contrasting her later fairy-like appearance.

Aya maintains a functional partnership with Shou, though his panic against opponents resembling his sister visibly annoys her. After Shou loses his final coin to Satomi, Aya permanently takes over his body. This transition causes her significant dissatisfaction due to her aversion to inhabiting a male form.

Needing to survive in the human world, Aya aligns with Satomi. She aids his schemes, including surveilling characters like Shohei and Chinatsu for his entertainment. During this time, she associates with another LRIG, Guzuko, often bossing her around despite their shared subordinate status. Their interactions suggest underlying camaraderie, as they continue spending time together after Satomi's influence wanes.

In Lostorage conflated WIXOSS, Aya initially works for Carnival but later shifts allegiances. Witnessing Carnival's impending defeat during the final battle, she and Guzuko choose to aid Kiyoi Mizushima's group, realizing Kiyoi's success would restore their original Selectors. Following the resolution of the Selector Battles, Aya is revived alongside Shou and appears walking with him in the epilogue.