Ai and Yu first meet the 22-year-old Lisa Pacifist (Risa Patsifīsuto) in the Subway, where she decides to help the twins search for their parents in Wonderland. She is able to manipulate spirits found in nature through the use of her Kigen Arts and uses this power to protect the two twins from the various monsters of Wonderland. Ai believes that Lisa came to Wonderland in search of her boyfriend, but her true reason for coming is still a mystery. It is greatly hinted that she has feelings for Kaze.

Source: Wikipedia