One morning, as Kobayashi prepares for work, she is startled to find a dragon's head peering at her from the balcony. The creature quickly transforms into a lively, curvaceous young woman dressed in a maid outfit who introduces herself as Tooru. The night prior, a drunk Kobayashi had encountered this dragon in the mountains and, out of pity, offered her a place to stay. Tooru has now arrived to honor that promise, eager to repay Kobayashi's kindness by serving as her maid. Although Kobayashi regrets her intoxicated decision and initially hesitates, she eventually allows Tooru to remain, driven partly by guilt and partly by Tooru's impressive dragon abilities. While Tooru proves capable in her duties, her unconventional methods often horrify Kobayashi and create more problems than they solve. Furthermore, Tooru's arrival on Earth stems from complex reasons, as she carries deep emotional burdens and painful past experiences. Complicating matters, Tooru's presence draws other mythical creatures to their home, each possessing unique quirks and personalities. As Kobayashi attempts to manage this chaotic household, she discovers she is ill-prepared for the challenges of living with a dragon maid.