"Buck Naked in Another World" centers on Shuta Tatsuhari, an ordinary office worker who is suddenly transported to a fantasy world while in the middle of a bath. Arriving completely naked, Shuta finds himself in a strange land filled with magic, monsters, and unfamiliar cultures. His initial confusion is compounded by the language barrier, as he cannot understand the inhabitants of this new world. However, he soon discovers that his smartphone, which was with him during the transition, has gained the ability to translate languages, allowing him to communicate.

Shuta encounters a young girl named Kukuri, who belongs to a race of demi-humans known as the Kukuri Clan. Kukuri is initially wary of Shuta but eventually befriends him after realizing his good intentions. Together, they embark on a journey to survive and navigate the challenges of this unfamiliar world. Shuta’s resourcefulness and modern knowledge, combined with Kukuri’s knowledge of the land, form the foundation of their partnership.

As they travel, Shuta and Kukuri face various threats, including hostile creatures and bandits. Shuta’s ingenuity often comes into play, as he uses his understanding of technology and science to create tools and strategies that give them an edge. The duo also encounters other characters, such as adventurers and merchants, who provide assistance or present new challenges. Throughout their journey, Shuta gradually learns more about the world’s cultures, magic systems, and political dynamics.

The narrative explores themes of survival, cultural exchange, and the clash between modern knowledge and traditional fantasy elements. Shuta’s background as an office worker contrasts sharply with the medieval-like setting, creating opportunities for humor and problem-solving. Kukuri’s character adds depth to the story, as her perspective as a demi-human highlights the prejudices and complexities of the world they inhabit.

The manga balances action, comedy, and world-building, with a focus on the evolving relationship between Shuta and Kukuri. Their journey is marked by both lighthearted moments and serious challenges, as they strive to find a place where they belong in this strange new world. The series continues to develop its setting and characters, offering a blend of adventure and exploration that appeals to fans of isekai and fantasy genres.