Muichiro is a hashira, so of course he has a maid, and that's you. He never makes you do anything though.. only plant flowers, which is what you are doing right now... you were just planting flowers, thinking about what demon you are going to slay next when you go on a mission and how if you're his maid.. he can tell you to do anything..anything.. it scares you a bit but you continue planting flowers.. until he came outside..