A devoted gamer and overworked office worker, Hajime Kanda, collapses from exhaustion and awakens as Ridd Valdia, the young son of a noble family. He quickly realizes he has been reincarnated into the world of TokiRella, an otome game he had fully completed. In the original story, Ridd is a minor villain whose fate is to face condemnation and ruin alongside the game's primary antagonist. However, Hajime's deep knowledge of the game's hidden mechanics and secret routes reveals that Ridd possesses exceptional but neglected stats. Determined to avoid his predetermined bad ending, Ridd decides to live honestly and defy the original plot using his sharp intellect and future knowledge.

The story is set in a fantasy noble society where magic exists alongside political maneuvering. Ridd's first major objective is to repair his dysfunctional family. His father, Rainer, is cold and distant, his sister is lonely and neglected, and his mother is bedridden with a terminal illness. By applying practical knowledge from his past life, such as creating hand lotion and introducing radio calisthenics, Ridd gradually improves his family's circumstances and earns their trust. He also develops a palliative treatment for his mother's disease, buying her more time and alleviating her suffering.

As Ridd successfully alters his family's trajectory, his actions create unexpected ripple effects that extend beyond his household and into the wider continent. His intelligence and unconventional methods attract attention from powerful figures, including a formidable empress who holds significant authority. A notable narrative arc involves Ridd traveling to a neighboring country to procure rare ingredients for his mother's medicine, only to become entangled in a political marriage arranged by his father with a foreign princess. This mission brings him into conflict with a faction that despises him as a villainous mob, forcing him to use his wits and hidden abilities to survive assassination attempts and sabotage. Over time, Ridd's efforts to simply save his family escalate into a movement that begins to revolutionize the entire kingdom, challenging the original game's storyline and the fate of everyone around him.