第 5 集: Kazuta 作為 Gravedigger 的身份曝光，導致致命爆炸，並揭曉 Inami 為幕後黑手。

Kazuta runs away after kissing Hondomachi, who quickly reports the event to Matsuoka. She guesses Kazuta might be the actual Gravedigger killer and that he wanted to kill Hondomachi, but his urges to kiss and kill might have been interchanged in his unconscious after the Perforator drilled a hole in his head. She further infers that a craving of love might be what drives Kazuta to kill. Sakaido dives into Kazuta's id well, where his findings help the investigation team confirm Kazuta as the Gravedigger, allowing Officer Nishimura and his team to raid Kazuta's home for his arrest. However they realize too late that Kazuta's home is rigged with a gas explosion, killing them and destroying the crime scene. The real Gravedigger mastermind is revealed to be Kazuta's former classmate Nahoshi Inami, a sadist with a crush on Kazuta who enjoys seeing fresh wounds and watching people die. The episode ends with Hondomachi holding Inami at gunpoint, not knowing Kazuta was hiding nearby with a knife. (Source: Wikipedia)

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