Fifteen years ago, Japan was hit with random supernatural attacks. In response, the government formed the Tactical Raveling Unit (TR1M), a division under the First Counter-Psychotrauma Division of the Special Measures Agency. Their main goal is to combat the Unraveled, a dangerous phenomenon. They are known for their efficiency. Nika Agou, a TR1M agent, is transferred to a remote area and believes it's because of her poor performance. But she soon finds out that the area is rampant with Unraveled activity, and a boy with ulterior motives offers a chance for Nika to regain the trust of TR1M.
