Yumiko Miura, a second-year student in Class 2-F, commands influence as a key figure in Hayato Hayama’s social circle, blending leadership with a sharp awareness of status. Sporting long, wavy blonde hair with curled tips and olive-green eyes, her gyaru-inspired aesthetic emphasizes trendy outfits and meticulous makeup, projecting an image of calculated glamour. Assertive and unyielding, she enforces a rigid social hierarchy, dismissing those outside her tier—exemplified by disregarding Saika Totsuka’s tennis court claim or pressuring Yui Yuigahama to adhere to group norms. Yet loyalty defines her bonds with Yui and Hina Ebina, contrasting her domineering facade. Vulnerabilities emerge when her authority falters: tearful clashes with Yukino Yukinoshita or fears of her clique’s collapse reveal a fragile core beneath her confidence. A former junior high tennis champion with prefectural titles, Yumiko now prioritizes shopping, karaoke, and nail art, avoiding tasks like cooking to preserve her polished appearance. Her romantic fixation on Hayato drives jealousy toward Yukino and a fierce defensiveness of his reputation. Exposure to the Service Club catalyzes subtle growth. Yukino’s critique of her self-centeredness prompts introspection, leading to an apology to Yui and reluctant participation in Hachiman Hikigaya’s morally ambiguous plan to aid Rumi Tsurumi. She increasingly prioritizes cohesion over control, stalling cultural festival disputes and supporting Yui’s role to stabilize the group. Complex dynamics define her relationships: she mentors younger students at summer camp, discreetly checks on Iroha Isshiki’s well-being, and privately grapples with her circle’s fragility during Tobe’s confession. These moments juxtapose her authoritative demeanor with quiet insecurity, painting a portrait of a leader navigating the tensions between image and authenticity.