Ai Kayano
A fourth and fifth season were announced on February 28, 2016, at the "Symphogear Live 2016" event in Japan, and are currently in production. The fourth season, titled "Symphogear AXZ" (pronounced "axis"), began airing between July 1, 2017 and September 30, 2017. The opening theme is "Testament" performed by Nana Mizuki, and the ending theme is "Futurism" performed by Ayahi Takagaki, with multiple new character and insert songs performed by Aoi Yūki, Nana Mizuki, Ayahi Takagaki, Yōko Hikasa, Yoshino Nanjō, Ai Kayano, Minako Kotobuki, Shōta Aoi, and Rina Hidaka.