By the end of the episode, Nina disappears, leaving a note for Tenma. It is implied she has set off to find and kill Johan herself to end the cycle of violence.
While hiding in a forest cabin, Nina blames Tenma for saving Johan, as his survival led to the current murders. She recalls Johan killing their parents and how he specifically asked her to shoot him. Monster (Dub) Episode 7
Tenma returns to the city to find the corrupt detectives were legitimate officers working for Johan. Meanwhile, the ruthless Inspector Lunge visits a separate crime scene at Heidelberg Castle and finds Tenma’s tie, further cementing Tenma as his primary suspect. By the end of the episode, Nina disappears,