The story follows Vivy, a songstress AI whose sole mission is to make everyone happy with her singing and to pour her heart into her singing. The entire series follows her struggle to figure out the meaning of "heart" and she slowly learns this through her travels with Matsumoto, a fellow AI who has come from the future in order to stop the war of humans vs AI- well he says war but it's more like the AIs massacring the humans. The individual stories are all portrayed really well with my favourite mini story being that of Estella and Elisabeth as they are forced to stop the Sunrise from falling and my least favourite being that of Ophelia. Overall, the story of this is amazing as the individual stories all come together at the end for what can only be a great ending- although I have one fault with it. I shall explain my fault here:

Spoiler, click to view

after Vivy finishes singing her song to help shut down all the AIs that have lost control and she and Matsumoto die in the process it cuts to her with very short hair waking up and seeing Matsumoto who tells her "your name is Vivy and your goal is to make everyone happy with your singing. Everyone is waiting to hear you sing." and then she smiles and gets up. I'm not sure what is happening here or whether this is some sort of dream as I really don't see a point as to why that was added in as it sort of took me out from the moment as I honestly felt the series could have ended on Vivy just dying but it ended on this so this brought down my overall scored for the series unless someone can explain to me why this was added to the end of the show.

Characterisation:
The characters are all quite interesting. Some are extremely well written- being Diva and Vivy and Elizabeth and others being not that well written- Antonio etc. My favourite character in the series is most likely either Elizabeth or Diva as I felt they were characterised the best out of all the characters. Antonio is my least favourite mainly because his motives didn't really make sense to me which is part of the reason why Ophelia's arc is my least favourite part of the series. Overall, the characterisation is a 7.5/10 as Antonio really let it down :(

Character Dynamics:
The best character dynamic in the series is a tie between Matsumoto and Vivy and Elizabeth and Estella for me. Both are displayed brilliantly with Matsumoto and Vivy's slow development through the years as they start off as unlikely allies who don't get along to be friends at the end:

Spoiler, click to view

with Matsumoto even sacrificing himself so Vivy can finish her song (people could say this was just him making sure the mission succeeded but part of me saw this as him protecting Vivy as a best friend)

and with Elizabeth and Estella being sister AIs who were separated upon being created

Spoiler, click to view

but get reunited and die together to bring down the Sunrise

The worst character dynamic is... and you probably saw it coming... Antonio and Ophelia as it honestly made no sense to me and made me want to drop the series. Overall, the character dynamics in this series are an 8/10 for me.

Visuals:
The visuals in this are incredible and are some of the best in anime. They aren't as incredible as 86 but still hold their own and I believe they stand at a 9/10 as some scenes are clearly well animated than others whereas other series are able to maintain a consistently good animation across the entire show.

Voice Acting:
The voice acting is good and I feel like it fits each character perfectly. However, there's not really much more to say asides from that. It never really stood out to me that much so I assume that they didn't do anything special as if they did I feel like I would remember something to say here XD so Overall, the voice acting in this was 7.5/10.

Music/Soundtrack:
The music in this series is extremely prominent for the entire series and it's a good thing that the songs are so great as they honestly carry the entire show at some points. Especially in the last episode with Vivy's final song. I'm also a huge fan of how the opening theme and ending theme are both connected to the series with the opening being sung by Vivy and the ending

Spoiler, click to view

being the song that Vivy composes herself in the series

Overall, the music in this is 9/10.

Fight Choreography/Pacing:
The fight scenes in this are very good. My favourite fight is definitely that between Elizabeth and Vivy on the sunrise but all the fight scenes were very cool to see although some were clearly better animated than others. Meanwhile, the pacing in the series was quite strange. I personally felt it was way too fast as it just went from event to another without much consequences although the final few episodes completely change that so overall the pacing isn't much of an issue and I would say it is 7.5/10 whereas the fight choreography is an 9/10.

Genre Mixing:
The genre mixing felt a bit stange in some areas with Matsumoto joking in an extreme life or death situation but asides from that there wasn't too much so there is not much to say regarding this so I would say it was 6.5/10

Conclusion and Score:
Overall, this series is great from start to finish (if you ignore the final scene) and I highly recommend it to anyone who has not seen it yet. I give this series an 8.5/10 as although it is really good there were lots of flaws in it that I have mentioned above but mainly from just partway through the series where I personally just got really confused- whether it was just my fault for being dumb or the series fault for not explaining properly I guess I'll never know XD