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.
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.
One common theme could be the exploration of their relationship in more intimate settings, given the 'lemon' aspect which often implies romantic or sexual content. However, many also focus on their emotional connection, like how they support each other through difficult times.
His songwriting skills are quite remarkable. Hiroki often writes lyrics that are both profound and accessible. He can take complex emotions like heartbreak or hope and put them into words that fans can understand and feel. His contribution to the songwriting process has helped shape the unique sound and identity of My First Story.