After reincarnation as a 9th class wizard and his pivotal role in ending the continent-threatening dragon war, a legendary mage embraces retirement through opening a quaint countryside restaurant. His peaceful enterprise takes an exciting turn when Rurin, a black dragon who has assumed human form, becomes his second-floor resident. Greedy and deeply ignorant of human customs—yet devoted and fiercely loyal—she adds vibrant chaos to his days. Together they navigate a warm and fulfilling lifestyle: welcoming diverse customers, resolving unusual problems, and nurturing violets in their garden. With magic interwoven with comedy and genuine connection, their tale unfolds as an enchanting adventure of unexpected companionship, personal growth, and joyful second chances.