It is a bit ambiguous in this case.
We found unfinished non-core content:
Project Symphogear: Next (Other)
Senki Kanshoku Symphogear: Shirabe Meshi (Spin-Off)
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:
Anime - Base
Release date: January 06, 2012
Anime - Sequel
Release date: July 05, 2013
Anime - Sequel
Release date: July 04, 2015
Anime - Sequel
Release date: July 02, 2017
Anime - Sequel
Release date: July 07, 2019
Senki Zesshou Symphogear revolves around two idol singers, Tsubasa and Kanade, who secretly wield powerful weapons called Symphogears. They use these weapons, fueled by their singing, to protect humanity from a mysterious alien threat known as the Noise.
After a tragic event where Kanade sacrifices herself to save a young girl named Hibiki, a piece of her Symphogear becomes embedded within Hibiki's body.
Years later, Hibiki unexpectedly awakens the latent power within her during another Noise attack. Now, Hibiki and a grieving Tsubasa must learn to cooperate and use their Symphogears to continue the fight against the Noise, despite the challenges and emotional baggage they carry.