Nagi Aiza
From Your Lie in April
Nagi Aiza is a supporting character in Your Lie in April, Takeshi Aiza's little sister, a talented middle-school pianist who becomes Kosei Arima's first student while hiding who she is. Brash, theatrical and devoted to her brother, she arrives resenting Kosei and leaves changed by him. She is voiced by Ai Kayano in Japanese and Stephanie Sheh in English.
About Nagi Aiza
Takeshi Aiza's little sister, a talented middle-school pianist who asks Hiroko Seto for lessons and is secretly assigned to Kosei as his first student. Nagi idolises her brother and resents Kosei for the shadow he casts over him, hiding her surname while she studies. Brash, theatrical and quoting The Phantom of the Opera, she learns from Kosei even as she challenges him, and their duet becomes a turning point for both siblings.
Appearance
Nagi is a petite middle-school girl with long light-brown hair worn in loose waves, bright expressive eyes and a flair for dramatic presentation that makes her seem older than she is. She dresses stylishly and speaks like a character in a stage musical, which is deliberate, since she peppers her conversation with references to The Phantom of the Opera, her great obsession. At the piano, the theatrics fall away and a serious, hardworking young musician shows through.
Personality
Nagi is loud, proud and hilariously dramatic, announcing herself like a villainess in an opera while being, in truth, a diligent girl who practises ferociously. She idolises her older brother Takeshi and has absorbed his rivalry second-hand, resenting Kosei for the shadow he casts, even while recognising, privately, how much she can learn from him. Her pride and her honesty are at war: studying under the 'enemy' forces her to judge Kosei by what he actually teaches her, not by the legend she grew up cursing.
Background & Story
Nagi grew up in her brother's concert-hall shadow, watching Takeshi devote his life to chasing Kosei Arima, and learning to resent the absent rival on his behalf. A gifted pianist herself, she asks the renowned Hiroko Seto for lessons, and Hiroko quietly assigns her to a teacher closer to her own age: Kosei himself, who has never taught anyone. Nagi hides her surname and studies under him as an ordinary student, torn between loyalty to her brother and the lessons she is actually receiving. Their work together builds toward a joint performance that becomes a turning point for both Aiza siblings, and for Kosei as a teacher.
Powers & Abilities
- Piano Talent: Nagi is a gifted young pianist in her own right, with technique and musicality strong enough for Hiroko Seto to take her development seriously.
- Duet Performance: Her four-hands work with Kosei, a demanding arrangement from The Phantom of the Opera, shows a stage confidence well beyond her years.
Key Relationships
- Takeshi Aiza: Her adored older brother, whose rivalry with Kosei she made her own, protecting his pride is her mission when she arrives.
- Kosei Arima: Her secret piano teacher, whom she intended to resent and instead learns from deeply, to her own theatrical horror.
- Hiroko Seto: The famous pianist she begged for lessons, who outmanoeuvred her completely by handing her to Kosei instead.
Quick Answers
Why does Nagi Aiza hide her surname?
Nagi is Takeshi Aiza's sister. She hides her name from Kosei because she doesn't want her brother's famous rival to know whose sister his new student is, she arrived with a grudge, not an application.
Who teaches Nagi Aiza piano?
Kosei Arima. Nagi asked Hiroko Seto for lessons, and Hiroko assigned her to Kosei as his first-ever student, believing teaching would help them both.
Who voices Nagi Aiza?
Nagi is voiced by Ai Kayano in Japanese and by Stephanie Sheh in the English dub.
