At first Aoi finds Shuusei annoying and arrogant. She then falls in love with him. She wishes to be seen as a girl and not a room-mate. Aoi is good at cooking, and she makes bentous for Shuuseil.
In chapter 22, when Shuusei is leaving, Aoi is running after him in the rain, she hugs him from behind and confesses to him. He then tells her that he doesn't hold the same feelings as she does, and walks away..
In chapter 29 Shuusei kisses Aoi after a misunderstanding about him and Satsuki and as of chapter 30 they are dating.