The tragedy of Ecstasy Trigger, a female special agent who fell into darkness!

Kurosaki Kana has been appointed to investigate serial rape murderer X. However, there is little information about X, not only his name, but his identity is unknown, and there is no proper photo of his face. Kana's father, Goro, who was once a special investigator, also worked hard to investigate X, but he died in his career just before he was determined to. Kana visits Kagami Eiji, the man who is his father's former subordinate and is the closest to X, and asks for his investigation cooperation. However, this Kagami Eiji is X. Kagami becomes interested in Kana and uses her medicine to take her consciousness...