Well, 'My Next Life as a Villainess: All Routes Lead to Doom!' can also be considered in a way. The main character has to navigate through a world with certain systems in place that can be seen as related to the ntr concept, especially when it comes to relationships and how they develop or are disrupted.
One popular 'kanojo ntr light novel' could be 'Ore no Kanojo ga Konna ni Kawaii Wake ga Nai' (My Girlfriend Is So Cute It's Unreal). It has an interesting plot with complex relationships.
One popular 'isekai ntr light novel' is 'The Rising of the Shield Hero'. It has elements of isekai where the main character is transported to another world. Although not strictly pure 'ntr' in the extreme sense, there are some relationship - related plot developments that might be related to the concept.
Another great one could be 'Overlord'. It involves a powerful character being trapped in a game - like isekai world. There are complex relationships and power dynamics that can be considered in the context of ntr elements in a rather unique way as different factions interact.
One example could be 'Jane Eyre'. In this novel, there are elements that can be related to a form of 'revenge' in the sense that Jane, after facing hardships and mistreatment, stands up for herself and finds her own path and happiness, which is a kind of victory over those who wronged her in a way.
One of the good NTR novels could be 'Your Lie in April'. It beautifully portrays complex relationships and emotions. The story is mainly about a young pianist and his interactions with different characters, which involves some elements of unrequited love and complex emotional entanglements that can be considered in the realm of NTR in a more emotional and psychological sense.
The 'ntr system light novel' typically has a strong focus on character growth in the face of these relationship - altering systems. Characters may start off with certain expectations about love, friendship, or loyalty, but as the story progresses, they are forced to re - evaluate and change due to the influence of the ntr system. It also often features a detailed world - building aspect to support the existence and functioning of the system, whether it's a magical, technological, or social system.
Sure. 'Kuzu no Honkai' is a good choice. It has a rather complex web of relationships. The characters often find themselves in situations where their feelings for one another are not as straightforward as they seem, and there are elements that can be considered NTR - ish in the way the characters interact with each other's romantic interests.
One popular Western NTR visual novel is 'Our Life: Beginnings & Always'. It has an engaging story and well - developed characters. The art style is also quite appealing.
I can't really recommend 'naruto ntr fanfic' as the concept often goes against the positive and ethical values of the Naruto series. Instead, you could try searching for fanfics that explore Naruto's training with Jiraiya in more depth, or those that focus on the relationships between the Konoha 11 in a positive way.
Well, 'Fate/stay night' is also a great choice among translated visual novels. It has been translated quite well and has elements that can be related to the ntr concept in some storylines. Also, 'Sakura Spirit' has a unique story and the translation makes it accessible to a wider audience.