Rie Komatsuzaki is the heroine of the Escalation chapter of the Cream Lemon series who is a talented pianist that is transferred to an all-girls Catholic school by her parents. She once was in love with her piano tutor, a young man a little older than she was, but was broken-hearted after finding him with another girl who was closer to his age. During the induction ceremony at her new school, she becomes smitten with the beautiful Naomi Hayakawa, who is a senior at the school. Rie is noticed by Naomi and unbeknownst to Rie that Naomi has dark intentions for her. Naomi arranges for Rie to become her roommate in the dorms and the love-struck Rie is excited. Naomi seduces Rie into frenzied passion that exhausts her and when Rie awakes she finds herself tied up and Naomi proclaims her as a pet for her desires and invites her current girlfriend, Midori to join in. Despite the feelings of sin she feels for letting herself be a slave to Naomi, she cannot resist her. Rie's humiliation is drawn further in the second Escalation episode after her piano recital she is taken to Naomi's villa and sees that the entire Hayakawa family is depraved as Naomi engages in S&M with her and a friend of Rie's named Mari. During the whole incident, Rie comes to see how much she enjoys what Naomi does to her.