Sirius, a coffee shop quietly operating in a corner of the royal capital, is so empty it’s a wonder it hasn't gone out of business. However, the shop's master, Gilbert, is actually a former strongest adventurer who has built a massive fortune—and he has zero interest in making money from the cafe!? Even with such a lack of motivation, customers who fall in love with the delicious food and comfortable atmosphere start visiting, and the shop gradually becomes lively……. A former strongest adventurer who defeated the Demon King and saved the world, and a cheerful, hardworking girl. A daily drama filled with laughter, tears, and occasional battles, shared by two people who hold secrets!