Ai Natsuno is a supporting character from the anime Chuhai Lips: Canned Flavor of Married Women. In her middle school years, she was a quiet and unassuming student with black hair who participated in the track and field club. She was one year younger than Tsuyoshi, the male protagonist, and secretly harbored feelings of admiration for him during that time. In the years since, her appearance has changed dramatically. She is now a married woman with long, bleached hair and sun-kissed skin, a look that contrasts sharply with her former plain and shy demeanor.

Ai's personality is a blend of boldness and vulnerability. On the surface, she is playful, mischievous, and straightforward, often taking the initiative in her interactions. She exudes a confidence that aligns with her transformed, tanned "gyaru" appearance. However, beneath this confident exterior lies a more sensitive side, as her actions are consistently driven by an enduring and genuine longing for Tsuyoshi. Her motivations are rooted in this unfulfilled affection from her youth, which she actively seeks to realize in her adult life.

Within the story, Ai plays a significant role as one of the married women who becomes intimately involved with Tsuyoshi. Their reconnection often occurs in his small, overheated apartment, where shared canned chuhai drinks create an atmosphere of relaxed intimacy. She is resourceful and inventive when it comes to creating opportunities to be with him, frequently using clever excuses to initiate closeness. For instance, she might hide her foldable umbrella on a rainy day to have a reason to seek shelter at his place. During their encounters, she often uses the disarming excuse of being too drunk to control her actions, a tactic that allows her to push boundaries while maintaining a playful facade.

Her key relationship is, of course, with Tsuyoshi. Their dynamic is defined by a nostalgic connection to their shared past and a present-day physical relationship that Ai actively pursues. Her actions are a mix of calculated schemes and earnest affection, creating a layered connection that is both playful and tender. Beyond her role as a love interest, her behaviors highlight a character who is resourceful, slightly cunning, and deeply infatuated, making her interactions lively and her character memorable. Her notable abilities are not physical or supernatural but rather social; she possesses a charming craftiness in fabricating innocent reasons to prolong her time with Tsuyoshi, demonstrating a persistent and clever approach to pursuing her desires.