Kazuya Nakanishi

In order to take over her grandmother's Dagashi store, art student Kumi Honamanuma moved to Kyoto. She met Harami Mino, K Kusanagi, Mai Haisaka, and a dog who lives in the store, which supposed to be empty. Kumi ended up living with these girls, who claim that they are heroes reincarnated to contemporary period to chase after the demon king. Harami and others seem to live in a peaceful life with no missions to to do anymore, Ran, who was demon king in the past and appears to be an elementary school girl from failing to reincarnate, one day. The story begins with Ran requesting to collect demon king's fragments.

As the conflict that began in Magical Girl Lyrical Nanoha: Reflection continues to escalate, Nanoha and her allies soon find out the troubled history between Iris and Yuri, which is related to the tragedy of Eltoria's "Planet Reclamation Committee".

The Chaldea Security Organization was founded to focus on preserving the continuation of human history. They observe a world which magecraft couldn’t observe, and science couldn’t measure, all to prevent the certain extinction of humanity. But one day, the future that Chaldea continued to observe disappears and humanity’s extinction in 2017 becomes clear. Based on the assumption that Fuyuki, a provincial town in Japan, is the reason for humanity’s extinction, Chaldea issues an order to explore, investigate, and possibly destroy this singularity – a quest for the Holy Grail, the Grand Order.