Прошло всего несколько недель с тех пор, как была одержана победа над Кэрол, но Хибики [立花 響] вновь сражается. Сражается из последних сил с самым грозным противником, известным человечеству — домашним заданием на лето. Однако, ей не суждено успеть до начала нового семестра — миру грозит новая опасность.

Цубаса [風鳴 翼] и Мария [マリア･カデンツァヴナ･イブ], занимающиеся расследованием Александрийского инцидента, сталкиваются с Баварскими Иллюминатами — организацией, стоявшей за Кэрол и инцидентом Фронтира. Отправившись за ними в разрушенную войной южноамериканскую республику Вальверде, носители «Мехасимфоний» становятся свидетелями невиданной ранее силы, способной одолеть самого Бога.

Hibiki Tachibana has defeated many powerful enemies, saved countless innocent lives, and escaped from numerous desperate situations, but she is currently finding herself unable to escape from her most desperate situation yet—summer homework! Although her high school life is relatively unremarkable, her career as a member of the military organization S.O.N.G. is anything but. Using powerful, ancient armor known as Symphogear, Hibiki and her teammates work with the United Nations to deal with international disputes and disasters.

During a mission briefing at headquarters, Hibiki is made aware of a mysterious organization known as the Bavarian Illuminati, who has been responsible for several major disasters in the past and currently operate in the war-torn country Val Verde. Together, Hibiki and her team infiltrate one of the Bavarian Illuminati's manufacturing plants and free hundreds of slaves. Exposed, alchemists Saint-Germain, Cagliostro, and Prelati reveal themselves as the organization's top brass, and—using alchemical powers—declare a global revolution while sacrificing thousands of lives. Faced with yet another threat to the world's survival, Hibiki and her allies must confront the Bavarian Illuminati in their most difficult and destructive battle yet.

[Written by MAL Rewrite]