Nanashiro Yuzu, a first-year Nadeshiko Academy student, enters the protagonist’s life as a stepsister when their parents’ relationship culminates in marriage plans. Renowned for her ethereal beauty, she attracts constant admirers, yet remains guarded, convinced others fixate solely on her looks. Her appearance—a slender frame, cascading dark hair, and arresting features—is accentuated by the academy’s uniform: a crisp white blouse, pleated skirt, ribbon tie, and belt, styled with understated elegance.

Though petite and seemingly fragile, Yuzu defies expectations as a dedicated high jumper in the track club, compensating for middling athletic talent with relentless effort and spirited determination. Her interests skew traditional—cooking elaborate meals and knitting intricate patterns—contrasting her sportive pursuits.

Yuzu’s tsundere nature masks tenderness beneath a prickly exterior. Balancing part-time shifts at an ice cream parlor and school life, she navigates evolving tensions with stepsibling Daisuke as their bond blurs familial boundaries. This uneasy intimacy challenges her to confront her insecurities, pushing her to lower her defenses and accept genuine connection. Her journey hinges on reconciling her crafted persona with her authentic self, bridging athletic grit, domestic creativity, and the messy realities of blended family bonds—all while grappling with vulnerability and the slow burn of trust.