So... is Shigatsu wa Kimi no Uso finished or not?
YES, it is finished.
Why?
The anime finished after the manga:
Anime finished: May 15, 2015
Manga finished: February 06, 2015
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Shigatsu wa Kimi no Uso
Your Lie in April
Anime - Base
Release date: October 10, 2014
Shigatsu wa Kimi no Uso: Moments
Your Lie in April: Moments
Anime - Prequel
Release date: May 15, 2015
Synopsis
Kousei Arima, once a piano prodigy, is now haunted by his past. The loss of his mother left him unable to hear the sound of his own playing, effectively ending his musical career.
He lives a muted life with his friends, content to avoid the world of music that once defined him.
However, his monochrome existence is disrupted by the arrival of Kaori Miyazono, a vibrant and unconventional violinist. She pulls Kousei back into the world of performance, asking him to be her accompanist.
As they collaborate, Kaori challenges Kousei to confront his trauma and rediscover his passion for music, promising to bring color back into his life through their partnership.