Meiko Yotsuba, a central figure, is first encountered as a university aspirant taking entrance exams. She gains admission to prestigious Keio University, unlike the protagonist Touma Inaba, who fails but lies about his acceptance to keep her interest. Her striking presence is accentuated by distinctive red hair, and her affluent background initially shapes her preference for dating college students.

Her romantic involvement with Touma begins during the exam period. However, their relationship is complicated by her existing, family-arranged engagement to a man living in Europe, a significant secret she maintains. After discovering Touma’s deception about his university status—exposed by a rival—she feels betrayal and heartbreak, leading her to distance herself from Touma and align more closely with Tatsuhiko Mashu, another Keio student pursuing her.

Despite this rift, her feelings for Touma resurface later. Suspecting Mashu of infidelity, she seeks solace with Touma, resulting in a brief physical encounter at a love hotel that rekindles their emotional connection. As her arranged marriage approaches, she initiates one final intimate meeting with Touma, explicitly framing it as a "memory" before her wedding, highlighting her internal conflict between duty and desire. Her narrative concludes with her departure for marriage, leaving her relationship with Touma unresolved but marked by mutual lingering sentiments.

Her character development reflects shifts between vulnerability and assertiveness. Early portrayals emphasize her allure and unattainability, while later arcs reveal her capacity for emotional risk-taking, particularly in her decisions to reconnect with Touma despite societal and personal pressures. Though her privileged social circle shapes her relationship expectations, her actions demonstrate moments of defiance against those constraints.