Ai Sunakawa (砂川 愛, Sunakawa Ai) is Makoto's older sister and a college student. Takeo mentions that she, like her brother, is a great and kindhearted person.
She is very beautiful. She looks a lot like a female version of Suna. She has long wavy strawberry blond hair and wears very stylish clothing that compliments her figure.
Like Suna, she is a kind person. While a calm person, she is more in tune with her emotions, becoming emotional fast and being a very expressive person in general. She is a very intelligent, observant person like Suna. While somewhat confrontational and harsh, she is actually a very sweet person who looks out for others, especially those she cares for and is extremely helpful and selfless. She is also very responsible, not liking it when others slack off and scolding those who she feels need to get their act together.