The tragedy of the fallen female special investigator in Ecstasy Trigger! Kusakabe Kana

A story featuring a detective as the protagonist, who takes on the challenge of investigating serial killer X. With little information on X, the protagonist's father also died during the investigation, and the person they trusted the most turns out to be X. The story unfolds with the protagonist being drugged and indulging in pleasure, leading to a surprising ending. The intertwining of investigation and pleasure may raise questions for some viewers.