Aki Adagaki is a 15-16 year old girl who possesses beauty and wealth but treats boys disrespectfully. Her talent lies in giving men humiliating nicknames when they ask her out. Despite being able to do so, she lacks direction outside of her home. For instance, she wore cosplay on a date, which shows her limited understanding of social norms. She heavily relies on her maid but does not treat her kindly. Additionally, Aki has an enormous appetite that causes her immense embarrassment.
According to her confession about Masamune in her childhood, she was abandoned by him without any notice just after promising that he would stay with her even if her parents were to divorce. But since the time he disappeared, she got a huge appetite and is still searching for the reason through Gasou Kanetsugu or the self-proclaimed Masamune of her childhood.