In a modern society advanced by science, hidden in its shadows, dark entities known as ayakashi demons thrive. Unknown to the public, warriors exist who silently eliminate these evil forces threatening humanity. They are the demon-slaying fighters, KougaiGAR, masters of shadow manipulation and conquerors of darkness. Seira, the sole female warrior of KougaiGAR, bears the sacred duty of protecting a mystical treasure. Alone, she embarks on a mission to fulfill her destiny at the promised location. However, a new ayakashi demon emerges, tracking her every move. Severely wounded from repeated battles, Seira struggles against mounting odds. Now, the truth behind her trials and ultimate fate will finally be revealed!