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.
Kaori unexpectedly appears before Kousei outside the hospital and "appoints" him as a substitute for Watari. They spend the day shopping and visiting their school, a sequence that parallels their early interactions in Episode 3. Shigatsu wa kimi no uso Episodio 16
Episode 16 serves as a pivotal emotional transition, shifting the narrative focus from Kousei Arima's musical recovery to the rapid deterioration of Kaori Miyazono's health. The episode introduces new character dynamics through Kousei's first teaching experience and deepens the thematic parallels between Kaori and Kousei’s late mother, Saki. It is revealed that Nagi is the younger