Asahi is Kōichirō's childhood friend, and is the same age as him; since they have known each other for a long time, she likes to address him as "Ko". She has a strong personality, however she is sometimes shown to be shy. Unlike Kōichirō, she is very interested in love and romance, and gets excited about the lessons at Aikyō about them. Again in contrast to Kōichirō, she loves sweet food, especially chocolate, so much so that Kōichirō sometimes refers to Asahi as a "chocolate junkie".