Grasping his head in pain, Vien has found himself in a dark backstreet alley inside of an unfamiliar city and in an unfamiliar body. With his eyes blurring and shaking, he experiences unnatural and random headaches followed along with unfamiliar and fragmented memories that doesn't belong to him. Vien, seeing those memories has then decided to live as Adam while working in an organization that investigates maddening events and disposes of mysterious monsters and entities all while trying to find out the reason why he transmigrated.