Кобаяси [ 小林さん] — одинокая офисная сотрудница, единственный друг которой — коллега Макото Такия [滝谷 真]. Каждый вечер она «празднует» окончание рабочих будней в разных забегаловках.

Одним таким вечером Кобаяси встречает раненного дракона по имени Тору[ トール], которой наобум предлагает жить у неё. Тору на радостях соглашается и решает стать горничной Кобаяси. Не имея представления о жизни людей, Тору будет творить много глупостей.

Но одной творить — скучно. Потому следом за Тору приходит Канна [カンナカムイ], поначалу желавшая просто вернуть мятежную дракониху, но от бессилия оставшаяся с ней.

Тем временем, прознав о том, как Тору и Канне весело в мире людей, друзья и знакомые драконы также прибывают в этот мир и пробуют ужиться в нём по их примеру. Кто-то — становится отаку, другая — откликается на призыв маленького мага, а третья — начинает работать в одном офисе с Кобаяси.

As Kobayashi sets off for another day at work, she opens her apartment door only to be met by an unusually frightening sight—the head of a dragon, staring at her from across the balcony. The dragon immediately transforms into a cute, busty, and energetic young girl dressed in a maid outfit, introducing herself as Tooru.

It turns out that the stoic programmer had come across the dragon the previous night on a drunken excursion to the mountains, and since the mythical beast had nowhere else to go, she had offered the creature a place to stay in her home. Thus, Tooru had arrived to cash in on the offer, ready to repay her savior's kindness by working as her personal maidservant. Though deeply regretful of her words and hesitant to follow through on her promise, a mix of guilt and Tooru's incredible dragon abilities convinces Kobayashi to take the girl in.

Despite being extremely efficient at her job, the maid's unorthodox methods of housekeeping often end up horrifying Kobayashi and at times bring more trouble than help. Furthermore, the circumstances behind the dragon's arrival on Earth seem to be much more complicated than at first glance, as Tooru bears some heavy emotions and painful memories. To top it all off, Tooru's presence ends up attracting several other mythical beings to her new home, bringing in a host of eccentric personalities. Although Kobayashi makes her best effort to handle the crazy situation that she has found herself in, nothing has prepared her for this new life with a dragon maid.

[Written by MAL Rewrite]