The future is a great unknown. Throughout history, those who have been graced with the power to read it have been sought by many. In this day and age, the term "prophet" is outdated. "Precog," as in precognition, is the modern term. Yet when the powers of precognition are graced upon a young girl named Tohyama Haruka, she is sought after by a powerful organization. Utilizing her powers, Haruka makes contact with Hijikata Mamoru, a blind swordsman. When cornered by her captors, Haruka proposes an outrageous condition to Mamoru. Haruka wants Mamoru to protect her until death do them part.