"Restaurant to Another World" is a fantasy manga series that revolves around a mysterious restaurant known as "Western Restaurant Nekoya," which serves as a bridge between the human world and a fantastical realm filled with diverse races and creatures. The restaurant opens its doors every Saturday, attracting a wide array of patrons from the other world, including elves, dragons, demons, and humans from different cultures. Each chapter typically focuses on a specific character or group of characters as they discover the restaurant and experience its unique cuisine.

The narrative is episodic, with each installment highlighting the personal stories and backgrounds of the patrons as they interact with the restaurant's owner, a calm and skilled chef simply referred to as "Master." The dishes served, ranging from classic Japanese comfort food to Western staples, evoke strong emotional responses from the patrons, often reminding them of cherished memories or providing solace in times of hardship. The restaurant becomes a sanctuary where individuals from vastly different worlds can connect over shared meals, transcending cultural and racial boundaries.

Key recurring characters include Aletta, a demon girl who becomes a waitress at the restaurant after being saved by Master, and Kuro, a dragon who frequently visits in human form to enjoy the food. Other notable patrons include Sarah, a half-elf adventurer, and Heinrich, a human knight. The interactions between these characters and the restaurant's staff, as well as their individual experiences with the food, form the heart of the story.

The manga emphasizes themes of cultural exchange, the universal appeal of food, and the power of shared experiences. The restaurant itself serves as a neutral ground where conflicts and prejudices are set aside, allowing for moments of understanding and connection. The narrative is driven by the exploration of each character's relationship with the restaurant and how it impacts their lives, making it a character-driven series with a strong focus on world-building and emotional resonance.