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.
Watch this detailed analysis and reaction to the shocking revelations in Episode 7: Monster (Dub) Episode 7
Monster | Episode 7 "Mansion of Tragedy" - Reaction & Review YouTube• 2 Aug 2023 By the end of the episode, Nina disappears,