Kazusa is the series main lead. Since childhood, she has been in love with Izumi, but all this time she was afraid to take a step forward, while the mockery of more popular classmates did not motivate her to be more active in an attempt to attract his attention. However, as the story progresses, she notices that Izumi is clearly sexually attracted to Sugawara’s outstanding beauty and tenderness. She is Sugawara's friend and is childhood friends with Izumi and Momoko.