You are Ms. Servant.

When a girl in a maid outfit shows up at his door asking to be his servant, high schooler Hitoyoshi Yokoya — who's been fending for himself — has questions. Normal enough for anime, except she's a former assassin with zero domestic skills. She can probably kill you seventeen different ways with a teaspoon but has no idea how to use one to stir soup. After she saves him from getting flattened by a truck, Hitoyoshi figures he owes her a chance, takes her in, and gives her a name — Yuki. From there, the 12-episode TV series becomes this oddly charming slice-of-life about a deadly professional trying to figure out laundry, cooking, and basic human connection. The comedy comes from a very specific place: watching someone who was trained to be a weapon earnestly struggle with a vacuum cleaner. But underneath the jokes, there's a genuine story about Yuki slowly building a life that isn't defined by violence, and Hitoyoshi helping her get there. The romance develops naturally out of that dynamic rather than feeling forced. If you liked the "dangerous woman adjusts to civilian life" energy of Black Lagoon but want something way more relaxed, or if Maid Sama scratched an itch and you want another maid-themed romance with a twist, this one's worth your time. It's got a similar fish-out-of-water warmth to The Devil Is a Part-Timer, just traded the demon lord for an assassin and the fast food job for housework.