Maybe 'True Blood' manga is somewhat similar. It features a complex web of relationships and supernatural elements, similar to the world of Twilight. The focus on forbidden love and the challenges faced by the characters are common traits.
Well, 'The Vampire Diaries' manga could be comparable. It shares the theme of vampire love and drama that Twilight is known for. Also, the character dynamics and emotional conflicts have some similarities.
One manga that comes to mind is 'Neon Genesis Evangelion: The Shinji Ikari Raising Project'. It shares some similarities in themes and style with the original Evangelion.
I think 'Monster' is quite similar. It has a dark and complex narrative like Oldboy, with deep character exploration.
One that comes to mind is 'Vinland Saga'. It shares similar dark and gritty themes along with complex characters.
You might like 'Nanatsu no Taizai'. It has a similar adventurous and magical tone as Fairy Tail. The characters have strong bonds and face powerful enemies, and the story has a good mix of drama and lighthearted moments.
One manga that could be similar is 'K-On!' It has a similar lighthearted and fun atmosphere with cute characters and school life themes.
You could check out 'Gunslinger Girl'. It shares some elements of intense action and complex characters like in Kill Bill. The storylines have a certain edge to them.
Not many mangas are exactly like Killing Stalking. But some that might have similar dark and intense themes could be 'Tokyo Ghoul' or 'Parasyte'.
I think 'Your Lie in April' could be similar. It has elements of complex emotions and explores the depth of human relationships like Love or Hate.
I think 'Barakamon' is somewhat similar. It also has a laid-back and heartwarming tone like Silver Spoon.
Maybe 'Orange' would be a good choice. Both have a focus on internal struggles and character development that could be comparable to 'PTSD Radio'. There are elements of drama and self-reflection that are common to both.