The 'the story of us novel' could be centered on the lives of its characters. It may explore themes like identity, self - discovery, and the power of human connection. For example, the characters might start out as strangers and through a series of events, they become intertwined in each other's lives. Their individual stories merge to form a larger narrative that could be about hope, redemption, or simply the beauty of shared experiences.
I'm not sure exactly as I haven't read it. But it might be about the relationship between two or more people, their experiences together, joys, sorrows, and how their story unfolds over time.