Lily Someya, a half-Austrian, half-Japanese transfer student raised in Japan, navigates high school with a striking presence—tall, slim, and long-legged, her refusal of modeling offers contrasts her eye-catching figure. Openly lesbian, she directs affection solely toward girls, her aversion to men rooted in past mockery and harassment. This disdain triggers physical hives when males touch her, particularly Nozomu "Baka" Tanaka, whom she blocks with makeshift book-and-tissue barriers before relocating entirely. Balancing blunt candor with calculated social maneuvering, she maintains popularity by sidestepping group clashes, masking vulnerabilities with playful teasing.

Her fixation on Kanade "Majime" Ninomae teeters between admiration and attraction, their near-kiss encounters softened by Kanade’s earnest logic, which disarms Lily’s defenses. Conversely, Saku "Loli" Momoi’s innocent demeanor clashes with Lily’s bold desires, culminating in impulsive acts like groping Saku during a bra fitting and wrestling with self-restraint to avoid kissing her—struggles she dismisses as battling "inner demons."

A fabricated tale about childbirth, spun to Saku, ignites a public feud with Tanaka, their clash earning classmates’ jokes of a "married couple’s spat." This mischief underscores her thorny rapport with Tanaka, whose idiocy provokes both allergic reactions and reluctant curiosity.

Born to an Austrian father and Japanese mother, Lily’s familial history remains vague, the narrative prioritizing her school life as she grapples with sexuality, phobias, and the push-pull dynamics of her relationships.