One common theme is trust. When two people keep a secret, it tests the level of trust between them. For example, in many mystery novels, two characters might keep a secret about a crime they witnessed. If one breaks the trust and reveals the secret, it can have serious consequences.
Well, without having read it, it could potentially be a story where the concept of two people keeping a secret forms the central theme. Maybe it involves a plot where the two have to protect this secret from a world that is trying to uncover it. For example, they could be in a small town where everyone is nosy and they are protecting a family heirloom's secret or something like that.
Another novel could be 'Gone Girl'. In this book, the two main characters have numerous secrets from each other and from the outside world. The secrets are gradually revealed throughout the story, leading to many twists and turns in the plot.
Since we have no information about the actual story, the main characters could be a man and a woman. Maybe they are in a romantic relationship and the secret they keep is related to their past. Or they could be two business partners with a secret deal that could make or break their careers. There are so many possibilities without more context about the novel.
In many cases, secrets can be kept in romance novels. They might add mystery and drama, influencing the relationship development. Sometimes the secret being revealed leads to a big climax or resolution in the story.
It really varies. Some manga have characters who can keep secrets well, while in others, secrets are spilled easily. It all depends on the story's context and the personalities of the characters.
It really varies. A well-crafted secret in a novel can make it more intriguing. But if not handled properly, it might seem forced or predictable. The key is how the author reveals and plays with the secret throughout the story.