Noelle, a spirited and tenacious angel trainee, radiates naive kindness alongside an unwavering resolve to earn her guardian wings. Her life intertwines with Yuusuke Kamoshita when he stumbles upon her in a forest, triggering her eccentric supernatural family—a Frankenstein-inspired father, a witch grandmother disdainful of humans, a vampire brother allergic to cats, an invisible older sister, and an inventive younger sister crafting flying gadgets—to transform his home into a sprawling castle.

Driven by a discovered note where Yuusuke describes his crush as an “angel,” Noelle fervently dedicates herself to becoming his celestial protector. She relentlessly tests flight contraptions built by her younger sister, launching from makeshift runways despite repeated crashes. Her pursuit faces sabotage from adversaries like Silky and Dispel, the latter coerced into kidnapping her multiple times before her family’s interventions.

Noelle’s origins trace to a fractured angel-egg, binding her fate to Silky and Mikael; all three must ascend as angels together. Though Silky resists this destiny, Noelle’s unyielding empathy eventually unites them. Meanwhile, her dynamic with Yuusuke shifts from earnest, one-sided affection to reciprocated love, culminating in mutual heartfelt confessions.

Bubbly and endlessly persistent, she balances hyperactive antics—chasing Yuusuke or tinkering with flight gear—with deep loyalty to those she cherishes. Her optimism softens foes and rallies allies, showcasing resilience against setbacks. Visually, she stands out with cropped blonde hair, bright blue eyes, and an ever-present halo marking her incomplete angelic status.