" Literature Girl " was a Japanese novel. The plot where the male protagonist and the female protagonist got married in the end was not in the main plot of the story. In the novel, the male protagonist once dated a woman, but the two broke up for some reason. After that, the male lead began to interact with the female lead and gradually developed feelings for her. Although the male lead had a sweetheart and broke up with her, the relationship between him and the female lead was gradually developed. The male lead also expressed his feelings to the female lead. In the end, the male and female protagonists came together in the story of the novel and got married. There could be many different reasons and explanations for why the male protagonist would end up marrying the female protagonist, depending on the plot of the novel and the setting of the author.