"What exactly is our relationship?" Every time she asks, he just gives a bothersome smile and remains vague. Koyuki Kamisato had feelings for her childhood friend, Satoru Takayama, and they already shared a physical bond. However, the definitive words she sought were never granted. Despite that, he would get moody if she spoke even a little with other boys, forcing his excessive possessiveness upon her. She undoubtedly loved him once. But now, she is worn down by the reality that she is nothing more than a "convenient woman kept for sex." In that darkness, the one who reached out to her was her classmate, Guest. Words that were straight and sincere, unlike Satoru's. A sense of comfort from being treated with importance as a human being. 'I loved you, without a doubt. ...But, I want to end this now.' She breaks free from the curse of her mediocre, bottom-tier childhood friend and learns what true affection is.