Ai and Nobu were friends when they were kids, but they lost touch after her family moved away. She came to Tokyo for college, and offered a helping hand (and her apartment) to her old friend in his time of need. A young woman who treats everyone she meets with equal kindness, she practically exudes an aura of purity. Sometimes it's hard to tell if she's really just that nice, or maybe a little naive. Smart and athletic, she may seem perfect at first, but she can be surprisingly stubborn at times. She also has a more laid-back, casual side that she only shows in private, and to those she truly trusts. Ai's kind heart can sometimes get her in trouble. She has a habit of throwing her all into helping people, treating their problems as her own, while forgetting to take care of herself.