Eri Takabe is a Japanese girl with striking blue or violet hair, typically worn in a long ponytail reaching her waist or beyond, featuring distinctive side strands. Her violet or red eyes contrast with her pale skin. She stands at 155 cm tall, with measurements of 83 cm (bust), 59 cm (waist), and 89 cm (hips). As the daughter of the chairman of the affluent Takabe Group, founded by her grandfather, she occupies the role of an "ojousama" but actively resists being defined solely by her wealth, yearning instead to be treated as an ordinary person. A first-year violin student at Shukusei Music Academy, Eri possesses a personality blending kindness with strictness, underpinned by a powerful sense of justice and remarkable intuition. This perceptiveness allows her to uncover covert surveillance targeting students. Her story involves resisting attempts at exploitation. Initially, she remains untouched by compromising situations affecting others, using her insight to disrupt the antagonist's schemes. Later installments, however, depict her becoming vulnerable to assaults she previously evaded. A pivotal moment occurs when she realizes her existence is part of a video game construct. This meta-awareness drives her to intervene beyond her fictional world, seeking to aid both the antagonist and the audience. She attempts to travel between dimensions to confront the nature of their reality. Her wardrobe frequently includes school uniforms, pleated skirts, vests, ribbon hair ties, pajamas, hoodies, and aprons, reflecting her academic life and daily routines.