Touma Kamijou is a student living in Academy City, a highly advanced place in terms of technology. Despite being gauged as a level zero esper (no powers), he possesses on his right hand the Imagine Breaker, an ability that negates any power whatsoever. Touma finds a young girl named Index who is trying to run away from Necessarius, a powerful magic organization that she is member of. Blessed with the skill of memorizing any sort of information, she holds 103,000 forbidden magical books within her head. As science and magic cross paths, Touma must face several dangers amid espers and magicians who appear in the exciting scientific town.

When a sickly young girl suddenly becomes obsessed with inventing new things, her family and friends are all puzzled. "What has gotten into Myne?" they wondered, never dreaming that the answer is not a "What" but a "Who": Urano Motosu, a book-loving apprentice librarian who died in an earthquake in Tokyo who somehow found herself in Myne's body! And since Myne's world is still in a medieval stage, where books can only be owned by the elite, the new Myne intends to do everything she can to bring her beloved books to the masses in the time she has left.

A side story of the original Kara no Kyōkai - the Garden of sinners movie series divided into 2 parts. In the first part, Shizune Seo, who finds her life too predictable due to her precognition, and Mitsuru‎ Kamekura, who uses his precognition to be a professional bomber, meet Mikiya and Shiki, respectively, and their futures begin to change. In the second part, 10 years after the original series, Shiki and Mikiya's daughter, Mana Ryōgi, spends a day with Mitsuru.

The story follows the sometimes happy, sometimes sad, and a tad stressful daily life of "some sort of small, cute creature" (Nanka Chiisakute Kawaii Yatsu) known as Chiikawa. Chiikawa enjoys delicious food with bees and rabbits, toils hard every day for the rewards of work, and still maintains a smile.

During a concert by idol group Zwei Wing, an alien force known as the Noise attack the stage. Group members Tsubasa Kazanari and Kanade Amou suppress the attack using their Symphogear armor, but despite their best efforts, innocent bystander Hibiki Tachibana is fatally injured. Distraught and much to Tsubasa's dismay, Kanade sacrifices herself in the process to save Hibiki. Two years later, Hibiki lives on. Tsubasa now fights alone. With the threat of the Noise increasing, Hibiki finds herself encountering the Noise once again but this time she is granted a chance to become attuned with the same Symphogear that Kanade wielded.