Rie Komatsuzaki, a talented pianist, transferred to an all-girls Catholic school after a distressing encounter with her piano tutor. She had held romantic feelings for him until discovering his involvement with another woman, leading to disillusionment with male relationships and prompting her school change. At her new school, Rie developed an immediate romantic attraction to upperclassman Naomi Hayakawa. Naomi noticed this interest and arranged for Rie to become her dormitory roommate. Naomi then initiated a sexual relationship with Rie, who initially presented as reserved and devout. Following their first intimacy, Naomi restrained Rie, declared her a submissive partner, and invited her existing girlfriend Midori to join them. This established a polyamorous dynamic where both Rie and Midori addressed Naomi as "oneesama." Despite her modest outward demeanor, Rie actively participated in BDSM activities within this relationship, embracing a submissive role frequently involving bondage. Her participation extended to encounters at Naomi's family villa after a piano recital, where she witnessed broader familial involvement in similar practices. During these experiences, Rie acknowledged deriving pleasure despite initial feelings of guilt or humiliation. The relationship progressed with Rie maintaining primary devotion to Naomi, persisting through her remaining school years. This commitment culminated in her graduation and decision to cohabit with Naomi, permanently consolidating their partnership. A visual novel reboot features a character sharing Rie Komatsuzaki's name but exists in an alternate narrative universe unrelated to the original storyline.