Kurumi Nishina is a central character in Dōkyūsei: Climax. She is a teenage high school student with long brown hair and brown eyes. Her personality is strongly influenced by her upbringing under an overprotective father, which led her to believe that romantic relationships should remain pure and free from physical intimacy. This conviction often puts her at odds with her boyfriend, Kazuya Sakagami, who wants a more physical connection, and creates tension in their relationship. Despite the friction, Kurumi is fundamentally kind and values emotional bonds. She maintains a friendly rapport with the protagonist, Wataru Mooroka, and occasionally turns to him for a male perspective to help her understand Kazuya’s point of view. Her role in the story revolves around navigating the conflict between her ideals and the realities of a romantic partnership while being part of the group of girls connected to Wataru. Key relationships include her strained romance with Kazuya, her supportive friendship with Wataru, and the lasting influence of her father. Over the course of the narrative, Kurumi gradually begins to consider different ways of approaching love, driven by her conversations with Wataru and her desire to improve her relationship with Kazuya. As a normal schoolgirl, she possesses no supernatural abilities; her defining trait is her steadfast commitment to her notion of a pure relationship, which both shapes her decisions and presents her greatest personal challenge.