|Born||June 14, 1988|
|Occupation||High School Student|
|Seiyuu||Maki Kobayashi (as Mio Ogawa)|
Ai is from the same junior high as Makoto, but she transferred in during third year. Like Sekai and Otome, Ai also has had feelings for Makoto since high school. However, she's also far more open about it than the other two and acts more directly in a way to achieve her goal, willing to destroy both Kotonoha and Sekai's relationship with Makoto in the process and indirectly drag Yuuki Ashikaga into the problem as well.
Outwardly, Ai is impeccably polite and friendly. She's very self-conscious and apologizes incessantly when she wrongs someone else. She often has trouble speaking her mind however, and this fact leaves her easily manipulated. Despite this exterior friendliness though, she is actually quite cruel when she's trying to get what she wants. In both Cross Days and Shiny Days, she lies and cheats those around her to try end up in a relationship with whoever she's pursuing, be it Yuuki or Makoto. However, in Roka's true ending, she graciously accepts her loss and lets Yuuki be together, leaving town in order to raise the child she bears on her own.
In both versions, Ai is a minor supporting character who attends the Radish restaurant on occasion. Her first appearance in Shiny Days features her staring thoughtfully into the distance. She's friends with Otome and Karen, but the two often bully her around, forcing her to do much of the leg work in preparation for the Shrine festival. It is revealed that she and Makoto were supposed to confess to each other in middle school graduation, but failed due to Otome's intervention (which might possibly have been the catalyst for her developing her more manipulative tendencies; the belief that she would be cheated out of being with someone she cared about if she wasn't as ruthless as those out to stop her). Despite harboring feelings for Makoto, Ai is not a romancable heroine. She has a sex scene in one ending, in which she seduces Makoto while Setsuna's in Paris, but Makoto ultimately dumps her in favor of the aforementioned Setsuna.
- Her seiyuu Maki Kobayashi also voiced Natsuhi Ebata in both Summer Radish Vacation and Shiny Days.