She was in love with a student named Omoi Kata, and hoped to share her favorite umbrella with him whenever it rained since he did not have one, but was too shy to ever speak to him. One day, she left that umbrella on a train by accident, and her crush came to her to share his umbrella, for it turns out he too had a thing for her, much to her joy, and they went steady.
Later, she has been chastised by many male students, who claim she showed up to each offering to share her umbrella and then smacked them after asking for their name and grade, and fearing it could be a doppelganger, she sought Rinne’s help. Both he and Sakura investigated, and deduced her unrequited desires turned her lost umbrella into a Tsukumogami, as she had been holding it while longing to share it with him, and it created an illusion of herself and wandered around looking for her unrequited love. So Ai shows herself walking under an umbrella with her beau, to the umbrella, thinking that it will vanish now that her owner has gotten her wish, but much to everyone’s surprise it attacks Ai, asking her what she’s doing with another umbrella, for it also turns out that it wanted the guy to itself.
- Her boyfriend’s name means “Unrequited Love”, although the Kanjis used are different (加田重井).