Yandere Goroshi!!: Shuuchaku Yabame no Osananajimi ni "Watashi mo Suki" to Tsutaetara, Rabukome Route ni Shifuto Shimashita - Vol. 1 Ch. 6

[MangaDex]

 

[pulsary]

Stockholm syndrome manga

 

[jalajala]

hot damn!

 

[GreenDude1]

Stockholm syndrome manga

I mean it's pretty clear from the GetGo that she is crazier than he is. Also Stockholm syndrome wouldn't really work considering she was literally imprisoned for all of 5 Seconds.