Haruka Tōyama, a young girl, was kidnapped by agents of a company named EX-SOLID due to her precognition abilities. She later finds solitude with a man named Hijikita Mamoru, a blind swordsman, ex-kendoka and convict who is proficient in the use of a katana.

Before she was rescued, Haruka told Hijikita to protect her "Until Death Do Us Part." Later on, a secret and elite vigilante paramilitary group called the Element Network gets involved in protecting Haruka from unknown forces who seek her ability.