Hotel Inhumans

Hotel Inhumans has two concierges, Sara and Ikurō, who service a very particular clientele: assassins. Not only does the hotel offer top-class dining, relaxation, and entertainment, but it also boasts an ever-fresh arsenal of weapons, false identity creation services, and a world-class cleaner crew. Here, assassins cross paths with each other as Sara and Ikurō tend to their needs without question. <em class=de-emphasized>(from manga)</em>

Synopsis from Anime News Network