Oumae Kumiko starts her high school education with plans to join the wind instrument club. However, upon seeing that a former acquaintance from her previous school is also joining, she decides against it. The situation changes when her current classmates, Hazuki and Sapphire, express their desire to join as well. Influenced by them, Kumiko eventually overcomes her hesitation and declares her intent to sign up for the club.
Utatane Yasumi and Yuugure Yuuhi attend the same class in high school but rarely speak to each other, leaving them unaware that they both work as voice actresses. Both girls completely transform their personas while on the job, portraying innocent and enthusiastic teenagers.
As a child, Kouzuki Mahiru loved to draw. Her drawing of a jellyfish even won a mural contest, and she participated in creating the mural. Pleased with the result, she showed it to her friends, but they mocked her work. From that moment on, Mahiru stopped drawing and tried to live in a way that made her seem like an average, normal girl.
Kazanari Tsubasa and Amou Kanade formed the legendary idol unit known as Zwei Wing. They use their songs to power ancient relics used as Symphogear to fight Noise - creatures of unknown origin against which conventional weapons do not work. Humans are familiar with the existence of the Noise, but knowledge of the Symphogear is kept strictly confidential. One day the Noise attack one of Zwei Wing's concerts.
From an early age, Aono Hajime admired his world-famous violinist father, who inspired him to take such a career path himself. However, after his parents divorce, he decides that he will never play the violin again and chooses an ordinary high school without an afterthought.
Tachibana Arisu and several of her female colleagues are embarking on careers as professional idols. Their dream has just come true. They have been assigned a Producer to take care of them and take care of promotions. The girls' excitement leads them to heavily idealize his image in anticipation of their first meeting.
Nabatame Haru, Seibu Rio and Tamaki Kyouka form an idol unit called TINGS. Unfortunately, despite almost a year of activity, they are unable to gather crowds. The director of the agency they belong to, Hinase Yuuki, gives them an ultimatum - if they can't fill Nakano Sun Plaza in its entirety, their unit will be disbanded.
The year 2032 was a turning point for the idol world. The slow extinction of this subculture was initiated by the breakup of the legendary 7th Sisters unit. The media began to rally to the end of the idol era, and large corporations took it upon themselves to purchase buildings and land belonging to various agencies.
Studio 765 Production gromadzi trzynaście utalentowanych młodych dziewczyn o całkowicie odmiennych charakterach, które pragną zostać idolkami. Właściciel stawia sobie za cel uczynienie z nich rozpoznawalnych w całym kraju gwiazd. Zatrudnia dobrze rokującego menadżera mającego za zadanie odpowiednie poprowadzenie ścieżek rozwoju swych przyszłych podopiecznych. Początki nie są łatwe i przez większość czasu grupa idolek nie zajmuje się niczym innym niż treningi.