Kousei begins teaching Nagi Aiza, the apprentice of his mentor Hiroko Seto. Initially intimidated, he quickly adapts to the role, demonstrating a strict teaching style reminiscent of his mother’s training, though without the physical abuse.
Revealed as Takeshi’s sister; her internal monologue shows she is beginning to understand Kousei better despite her initial hostility. Shigatsu wa kimi no uso Episodio 16
It is revealed that Nagi is the younger sister of Takeshi Aiza, Kousei's longtime rival. Her motivation for taking lessons is to "destroy" Kousei, as she sees him as the cause of her brother's obsession. Kousei begins teaching Nagi Aiza, the apprentice of
Gains a new perspective through teaching Nagi; starts to notice the parallels between Kaori and his mother. Patient/Protagonist Kousei begins teaching Nagi Aiza
[Spoilers] Shigatsu wa Kimi no Uso - Episode 16 [Discussion]