One day, high school student Michio Kaga attempts to start a strange online game he found while browsing the internet. Instead, he gets transported to a rural village in the game's world, equipped with special skills and an overpowered sword. After collecting his thoughts, he finds himself battling against bandits and soon realizes that he cannot log out. Resigning himself to fate and accepting this reality, Michio sets out on a journey—enjoying his new life, conquering dungeons to earn money, and building a harem to satisfy all his manly desires.

Western Restaurant Nekoya is a popular eatery located on a street corner in a Tokyo shopping district. Serving both traditional Japanese fare as well as Western dishes, this eating establishment is popular among Tokyo's residents. But this seemingly ordinary restaurant is also popular with another type of clientele... While the restaurant is thought to be closed on Saturdays, the truth is that on this special day each week, its doors are instead opened to the inhabitants of other worlds. From dragons and elves to fairies and mages, this restaurant has no shortage of strange customers. Nevertheless, the enigmatic chef known only as "Master" will be waiting to serve up their favorite dishes with a kind smile and keep them coming back for many more Saturdays to come.

The Western Restaurant Nekoya is adored by its local Japanese clientele. The eatery's continued success can be attributed to its tasty western and Japanese dishes, as well as its cheerful head chef, "Master" Tenshu. In Japan, the restaurant appears to be closed on Saturdays, but in actuality, it is the one day that Nekoya transcends to the Other World and opens its doors to guests seeking foreign cuisine. From castles to forests, the "Restaurant to Another World"—as its patrons call it—travels far and wide. Nekoya's diverse and bizarre clientele can expect to be greeted by one of two devoted waitresses—the courteous demon waitress Aletta, or the enigmatic and elven Kuro. As customers, both old and new, pile into the establishment with stories of their respective lands, Master and his staff ensure that everyone is in for a scrumptious adventure of a lifetime.

Sex scenes that were cut from the main anime.