"Onaji Kao de Watahi wa Uso o Tsuku" centers on a young woman named Rika, who possesses a unique ability to transform her appearance into an exact replica of anyone she touches. This power, while seemingly advantageous, comes with significant emotional and ethical challenges. Rika uses her ability to infiltrate the lives of others, often assuming their identities to uncover secrets or resolve personal dilemmas. However, her actions frequently lead to unintended consequences, blurring the lines between truth and deception.

The narrative explores Rika’s internal conflict as she grapples with the morality of her actions. Her ability isolates her from forming genuine connections, as she fears rejection if her true self is revealed. Throughout the series, Rika encounters various individuals whose lives are intertwined with her transformations, including a detective who becomes suspicious of her activities and a childhood friend who struggles to reconcile Rika’s dual identities. These relationships force her to confront the ethical implications of her power and the impact it has on those around her.

The plot is driven by episodic arcs, each focusing on a different person whose identity Rika assumes. These arcs delve into themes of identity, trust, and the consequences of living a lie. As Rika navigates these complex situations, she begins to question whether her ability is a gift or a curse, ultimately leading her to seek a deeper understanding of herself and her place in the world. The series balances suspense with emotional depth, offering a thought-provoking exploration of human nature and the masks people wear in their daily lives.