Shino Kajiya, the daughter of a company president, finds herself engaged to Hajime Tachibana, a man who is successful, considerate, and extremely handsome. By all appearances, she should be the heroine of her own love story. However, Shino feels entirely out of place. She perceives herself not as the female lead but as a troublesome obstacle, the rival love interest whose role is to create conflict and suspense before being defeated so the real heroine can achieve her happy ending. This self-deprecating and ironic perspective sets the stage for a relationship filled with unexpected tension and emotional complexity.

The story takes place in contemporary Japan, navigating the worlds of corporate success and modern romance. Hajime is cheerful, honest, and friendly, while Shino is haunted by the feeling that she is merely an antagonist standing in the way of his happiness. Throughout the manga, the narrative explores the disconnect between Shino's perception of herself and the reality of her relationship with Hajime, turning traditional romantic comedy dynamics on their head. The series ran from 2017 to 2022, with its story concluding across five collected volumes.

Over the course of its publication, the manga follows the complicated push-and-pull between Shino and Hajime. Shino must constantly confront her own insecurities and the belief that she does not deserve to be the protagonist of her own life. The irony of her situation is that Hajime appears to be the perfect partner, yet the more challenging their dynamic becomes, the more it threatens to fall apart. This central conflict creates a narrative built on introspection and a unique voice, as Shino attempts to navigate a relationship where she feels she is the source of all the trouble, ultimately leading to a resolution that challenges her initial assumptions about love and her own worth.