Eighteen-year-old Harumi Misaki, a freshly graduated former yankee, lands a live-in job at a large mansion after a desperate job search. What greets him is not the straightforward employment he expected: the only resident of the mansion is a young girl named Maria, the sole daughter of the Tsukimisato mafia family, and the mandatory uniform is a frilly, feminine maid dress. Harumi, who goes by the nickname Mocha, is thrust into an unusual domestic comedy alongside other male maids, all tasked with running the household and protecting Maria. The story centers on this slightly warped communal life, blending slapstick humor with the constant undercurrent of danger that comes from being connected to organized crime. As Mocha adjusts to his new role and the flamboyant uniform, uneasy alliances form and tensions simmer beneath the surface. In later chapters, a rumor spreads that Vanilla, a senior maid who serves as Mocha's instructor, is a traitor to the Tsukimisato group, injecting a thread of suspicion and potential betrayal into the daily silliness of cooking, cleaning, and guarding a mafia heiress.