Two years ago, a pair of idols, Tsubasa Kazanari and Kanade Amō, collectively known as ZweiWing, fought against an alien race known as Noise using armor known as Symphogear. To protect a girl named Hibiki Tachibana, who got severely wounded by the Noise, Kanade sacrificed herself. Two years later, as Tsubasa has fought the Noise alone, Hibiki ends up gaining the same power as Kanade.
Nanami Haruka wants to be a song writer, so she attends an idol training school filled with handsome boys. The school pairs each aspiring songwriter with an aspiring idol, but Haruka finds herself paired with 6 bishounen idols. To make things more difficult, Nanami is also not allowed to date any of her beautiful partners.
When Nanami Haruka entered the master course she is faced with an even more difficult time. The main six members of Starish are assigned new seniors to help train them, but the seniors are not quite having the best attitudes about it