The Archmage's Restaurant

A man is reborn in another world as a powerful 9th-class wizard. After saving the continent from a devastating dragon war, he retires to a peaceful life in the countryside, opening a small restaurant. But his daily routine is far from ordinary. Upstairs lives Rurin, a black dragon who has taken the form of a woman—greedy, adorable, and fiercely loyal to him, yet completely clueless about human ways. Together, they share a cozy, amusing life, serving customers, handling odd situations, and tending to violets in their garden.