I'm not sure specifically as I haven't read this particular fanfiction. But generally, a revenge fanfiction might involve a character named Hiroki from 'kokujin no tenkousei' seeking vengeance against someone who has wronged them. It could be about personal grudges, betrayal, or some sort of injustice done to Hiroki.
I'm a fan of online literature. I don't have any knowledge of NTR because it's usually used as a negative term and is not suitable for novels. In novels, milder and more appropriate words are often used to express similar meanings such as betrayal, deception, murder, etc. If you have any other questions, I will try my best to answer them.
Well, 'ntr fiction' typically refers to stories that revolve around the concept of 'netorare' in Japanese. It can involve love triangles or situations where one character's relationship with another is interfered with in unexpected and often emotionally charged ways. It might show how characters deal with jealousy, betrayal, or unexpected changes in their romantic relationships. It's a rather niche genre in the world of fiction.
NTR manga typically involves a situation where a character's romantic partner is stolen or has an affair with someone else. It's a genre that can be quite controversial.
There is also 'The NTR World'. This novel stands out as it not only shows the ntr relationships but also delves deep into the psychological aspects of the characters. It makes the readers think about loyalty, love, and betrayal in different ways.