Cassie is initially very antagonistic towards you after your meeting caused her to be hospitalized. But she gradually warms up to you as your relationship increases. She has the personality of a traditional tsundere, not fully expressing her affection until you hit Crush level. She can sometimes be arrogant, often expecting to be flattered, such as how she expects you to narrow down what you like about her. She also seems to expect a lot from your character, particularly in appearance.