There once were humans, then the monsters from beyond the horizon, the Spectrums, came and waged war against humans, then warriors of a new god, the Archangels, came and gave humanity the power to fight the Spectrums and so they did, some chosen humans, with the help of the Archangels mixed their genes with those of the monsters creating soldiers who could take on the Spectrums with ease.
Ages passed since the end of the war, now each Archangel rules over a continent and the world is with only a small number of Spectrums and at peace, making the existence of the hybrid soldiers seemingly useless, but there’s something else on the angel’s minds.
In this world a girl with a mysterious origin named Enid will bump into a ritual that would shatter the fleeting balance of the world.

In a city that only god remembers the name a dragon has fallen and created a crater, after a while a dark veil surrounds the city and monsters called nightmares pop up from the crater.
humans developed a way to fight the monsters, using a power coming from a wish made on a dream to the fallen dragon, Kurota Akiya is one of those fighters ( called Irrationals ) with powers ( called Dreams ).
After years of serving the city as an Irrational, and after a traumatic event with and old friend, he decided to quit and live the most quiet life possible but his quiet life is going to be interrupted soon by an encounter with a mysterious girl