水都は薄明

To fight these demons, the people established The Special Security Guard, also known as Yonomori.

The protagonist, Mahora, also belongs to Yonomori and is on a mission to defeat the demons. However, he is currently living with Shuu, a demon he is supposed to defeat.

On the recommendation of the current commander, he and a group of problematic members of the guard are transferred to Special Division 3, which is tasked with defeating dangerous demons.

One day during a mission, he is attacked by another demon who orders Mahora to return Shuu to him.

[Translated from the official website.]