"Restaurant to Another World" is a fantasy anime series that revolves around a mysterious restaurant known as "Western Restaurant Nekoya," which serves as a bridge between two worlds. The restaurant operates in modern-day Japan but opens its doors to customers from a fantastical realm every Saturday, referred to as the "Saturdays of Closure." These customers include a diverse array of beings, such as humans, elves, dragons, demons, and other mythical creatures, all drawn to the restaurant by its unique and delectable cuisine.

The narrative is episodic, with each episode focusing on different patrons and their experiences at Nekoya. The restaurant's owner, a calm and skilled chef known simply as "Master," prepares a variety of dishes that cater to the tastes and preferences of his otherworldly clientele. The menu features both traditional Japanese dishes and Western-style meals, each crafted with care and precision. The interactions between Master and his customers often reveal their personal stories, cultural backgrounds, and the impact that the restaurant has on their lives.

Key characters include Aletta, a demon girl who becomes a waitress at Nekoya after being saved by Master's kindness and food, and Kuro, a dragon who frequently visits the restaurant in human form. Other recurring patrons include Sarah, a human noblewoman, and her bodyguard, a half-elf named Heinrich, who share a deep appreciation for the restaurant's offerings. Each character's visit to Nekoya provides insight into their world and the challenges they face, often highlighting themes of unity, understanding, and the universal appeal of good food.

The series emphasizes the cultural exchange and mutual respect that arise from sharing meals, as characters from vastly different backgrounds come together to enjoy the culinary creations of Master. The restaurant serves as a neutral ground where conflicts and prejudices are set aside, allowing for moments of connection and camaraderie. Through its episodic structure, "Restaurant to Another World" explores the transformative power of food and the joy it brings to both the giver and the receiver, creating a heartwarming and immersive experience for viewers.