Legends of the Blue Sky

is a Japanese light novel series written by Hisui Kawasemi, with illustrations by Yunagi. The series began publication on July 10, 2014 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Seventeen years ago. The world was devastated by an overwhelming attack by a myriad of monsters, Tsujigami.

The surviving humans have fled to a small floating continent and are spending their days trying to survive the enemy's assault. It is the battle armor  that human beings entrusted with a single hope against  who attacks mercilessly.

Dressed in Aigis, which gives humans the power to fly freely, boys and girls fly to the battlefield to defeat the huge enemy Tsujigami. Don't miss the exhilarating aerial battle where battles take place at overwhelming speed !!