The manga centers on homicide detective Hiroki Dan, the son of a former police superintendent general, and who seems to be on the fast track to career success. He maintains a hidden identity as a serial killer responsible for more than a hundred murders of people he deems beyond the reach of the law.

Osamu Hirota is an ordinary high school student. That is, until Soichi, a student from the next town over, takes him to a mysterious mansion with promises of meeting a seductress. Out walks a voluptuous woman named Miwako, who, as she undresses, reaches inside of Soichi and rips out his heart! The next day, Hirota awakens. Was it all a dream? Or have we just started to pull back the curtains on this dark and suspenseful story?