Yoishi runs a tavern in a fantasy city built around a labyrinth, and he is genuinely disappointed by the poor, bland meals the adventurers eat. When a group of rookies brings back bitter stone walnuts from the dungeon — ingredients usually dismissed as completely inedible — Yoishi refuses to give up. Drawing on culinary knowledge from his previous life in modern Japan, he experiments with preparation techniques to transform the walnuts into something worth serving. His success sets the pattern for the whole story: Yoishi treats every strange or unappetizing labyrinth ingredient as a challenge rather than a lost cause.

The manga follows his steady process of trial and error as he works with a rotating cast of adventurers who bring back unusual materials from their expeditions. Bone fish, mist meat, crimson melons, and other bizarre dungeon spoils become the basis for new dishes. Instead of relying on magic or overpowered abilities, Yoishi applies real cooking logic — soaking, roasting, fermenting, seasoning — to make the ingredients palatable and eventually delicious. His tavern becomes known for its labyrinth cuisine, attracting a growing crowd of customers who initially scoff but are won over by the flavors.

The core cast includes the new adventurers who first brought him the stone walnuts, a lively waitress who helps run the tavern, a stern but fair guild master who recognizes the value of good food, and a young dragon girl who becomes a recurring presence in the kitchen. There is a light romance thread that lingers in the background without taking center stage. The narrative arcs are structured around individual ingredients or recipes: Yoishi receives a new material, experiments with it, overcomes setbacks, and eventually serves a dish that satisfies both hunger and curiosity. Along the way, the meals help heal old wounds, build camaraderie, and change how the city thinks about dungeon resources. The tone stays warm and grounded, focusing on creativity, problem-solving, and the simple pleasure of a well-made meal.