"Totsuzen desu ga, Konya Sarai ni Ikimasu" centers on the life of Sarai, a young woman who unexpectedly finds herself transported to a parallel world after a chance encounter with a mysterious man named Kiri. This alternate world is governed by a strict hierarchy where individuals are bound by contracts with powerful beings known as "Nightlords." These contracts grant them extraordinary abilities but come at the cost of their freedom, as they are compelled to serve the Nightlords' whims.

Sarai is quickly identified as a rare "Contractless," someone who can form bonds with Nightlords without being bound by the usual constraints. This unique trait makes her a target for both the Nightlords and other factions vying for power in this world. Kiri, a Nightlord with a mysterious past, becomes her protector and guide, though his motives remain ambiguous. Together, they navigate a complex web of political intrigue, supernatural conflicts, and personal struggles as Sarai seeks to understand her role in this new reality.

The narrative explores themes of power, freedom, and identity as Sarai grapples with her newfound abilities and the moral dilemmas they present. The story delves into the relationships between humans and Nightlords, revealing the exploitative nature of the contracts and the societal divisions they perpetuate. Key characters include other Nightlords like the enigmatic and manipulative Shiro, who harbors his own agenda, and humans like Ruka, a former Contractless who serves as a cautionary figure for Sarai.

As the plot unfolds, Sarai's presence disrupts the fragile balance of power in the world, leading to escalating tensions and conflicts. The manga balances action, mystery, and character development, with a focus on Sarai's growth as she learns to navigate the dangers of her new environment while questioning the ethics of the system she has been thrust into. The story maintains a steady pace, blending episodic adventures with an overarching narrative that gradually reveals the deeper mysteries of the world and its inhabitants.