You slowly start to learn more about Ai and her character grows on you, how she is uncertain about what love truly means even though she is in an emotionally invested profession as an Idol. Her death scene was so unexpected where you can see the color in her eyes deteriorate as her life is fading away which is such a powerful depiction of death as it makes you emotionally invest in her as a character. In the end , she truly knew what love was as a mother rather than an idol.