Synopsis
Originally penned as a collaborative “concept novel” before production of the popular anime Vivy -Fluorite Eye’s Song-, don’t miss this rich science fiction tale of an AI songstress and her 100-year mission to save humanity–from the writers of Re:ZERO and Chaos;Child!
In an age when artificial intelligence has become integral to human life, AI songstress Vivy captures people’s hearts with her enthralling voice at a theme park, NiaLand. When a mysterious AI who calls himself Matsumoto appears and claims to be from one hundred years in the future, he warns Vivy of the coming apocalyptic battle between AI and humankind. Can Vivy help prevent an all-out war one hundred years hence, and save humanity from destruction?
LN information (wiki)(.epub)(official) 
By the author of Re:Zero kara Hajimaru Isekai Seikatsu
Genre: Science Fiction
Volume 01 or (Mirror)
Volume 02 or (Mirror)
Updated February 12, 2023
Volume 03 or (Mirror)
Next volume est. TBD
Password: thatnovelcorner.com
Kinda late, the anime already released long ago
And why is that makes it late?
I read it was more concept of made into anime and was not published before it. Anime was successful so they made it in to LN not other way around.