Yashiro Nene, a first-year Kamome Academy student, is a romantic idealist whose impulsive wish for love leads her to summon Hanako, a supernatural entity. To secure her crush’s affection, she swallows a Mermaid’s Scale, triggering a curse that transforms her into a fish upon water contact. Hanako mitigates the curse by ingesting another scale, forging a shared fate and appointing her as his assistant in managing the academy’s spectral disturbances. Her appearance features waist-length hair transitioning from cream-colored roots to teal-green tips, magenta eyes, and notably sturdy ankles—mockingly dubbed "daikon legs"—that fuel her self-consciousness. She wears a sailor uniform adorned with a skull brooch and magatama-shaped hair ornaments, hinting at her understated fascination with the macabre. When cursed, her fish form manifests pink-and-teal scales and horns mirroring her hair accessories. Optimistic yet naive, Nene confronts supernatural dangers with tenacity but grapples with insecurities about her allure and appearance. Initially obsessed with romantic fantasies, her focus shifts to understanding Hanako’s enigmatic past and shielding him from harm, despite his playful teasing. Her abilities include innate supernatural perception—later tied to a truncated lifespan—and partial aquatic transformation, with cursed scales serving as mystical currency. She uniquely manipulates rumors governing apparitions, a skill rooted in her role as Hanako’s aide and latent ties to the Far Shore. In the "New Present" timeline—a Clock Keepers-engineered reality—Nene avoids the curse by never contracting Hanako. Here, she thrives as a theater lead, her original memories suppressed until residual dreams revive her past, merging her confident alternate persona with her true identity. Relationships evolve dynamically: Hanako grows from a pragmatic ally into a figure she fiercely protects; exorcist Kou Minamoto offers steadfast camaraderie despite conflicting beliefs; childhood friend Aoi Akane anchors her emotionally while fretting over her spectral entanglements. A critical juncture reveals her lifespan dwindling to a year due to Far Shore exposure, spurring her to seek the Timekeeper and rewrite her fate without collateral harm. Her journey navigates mortality, loyalty, and self-acceptance as she straddles mundane aspirations and supernatural duties. Narrative arcs chart her growth from lovestruck adolescent to an agent confronting existential stakes. Alternate timelines and spin-offs recontextualize her choices, underscoring how shifting circumstances refine her compassion, resilience, and inquisitiveness without eroding her core identity.