Eri Takabe is a Japanese female character with striking blue hair and violet eyes. She stands 155 cm tall with body measurements of 83-59-89 cm. As a first-year violin student at Shukusei Music Academy, she comes from an affluent lineage: her grandfather founded a major department store, and her father chairs the Takabe Group conglomerate. Despite her privileged background, Eri actively prefers to be perceived as an ordinary girl rather than a wealthy heiress.

Personality-wise, Eri exhibits a strong sense of justice, blending kindness with unwavering principles. Her notably acute intuition allows her to detect hidden agendas and threats others miss, cementing her narrative role. This perceptiveness positions her as the primary obstacle to antagonist Shusaku, who infiltrates the academy by impersonating dormitory manager Kato. Eri exposes his scheme to blackmail and exploit female students, disrupting his initial plans.

When Shusaku resumes his campaign of revenge against academy residents—inflicting psychological and physical torment—Eri collaborates with fellow student Kaori to organize resistance. Their confrontations culminate in a critical encounter where Shusaku reveals his awareness of existing as a fictional construct within a game universe, framing the conflict in meta-narrative terms. Throughout these events, Eri persists as a moral counterforce against exploitation.