Estella and Elizabeth’s Heroic Sacrifice, sending away all of the residents and staff of the Sunrise and averting the disastrous crash from the original timeline, singing in unison to calm the humans while they burned up with the ship on impact. This act is so monumental that it does a complete 180 on Estella’s legacy, changing her from being remembered as the most malfunctioning AI in history to one that upholds the ideal to what an AI could be in the revised timeline.
Even though it is after a system reboot blocking away the Vivy personality, seeing Diva ascend through the years to finally be the star she always wanted to be, and finally learning what it means to sing from her heart, is quite awesome. Pity it doesn’t last..
Though it gets corrupted after seeing the A.I.s chant it as a mantra in the revised AI war, seeing Vivy compose a song, a reflection of the friends and experiences she’s had over the course of her mission, is quite stupendous, especially given that it was confirmed by the Archive that she was the first AI ever to achieve human levels of creativity. This act leads to the Archive choosing Vivy to be the one to decide if humans should stay.
Professor Matsumoto’s Heroic Sacrifice in all timelines, but especially in the second, urging Vivy and Matsumoto to go help the resistance in the revised timeline even though he knows that means his certain death.
Vivy’s final performance, singing the song she composed on the Main Stage, the song from her heart about all the connections she had made, shutting down all A.I.s connected to the Archive, including herself.
Fluorite Eyes Song, the song that the entire show had been building up to. At first only heard in an instrumental form that doubles as the show’s ending theme, we finally get to hear the song in full at the final episode as Vivy finally sings on the Nialand Main Stage, conveying everything she felt and experienced throughout her century-long journey as her song shuts down the rebelling AIs at the cost her own functionality.
, the song that the entire show had been building up to. At first only heard in an instrumental form that doubles as the show’s ending theme, we finally get to hear the song in full at the final episode as Vivy finally sings on the Nialand Main Stage, conveying everything she felt and experienced throughout her century-long journey as her song shuts down the rebelling AIs at the cost her own functionality.