I am Mita, Your Housekeeper

Mita Akari is a mysterious housekeeper who is completely unsociable. However, she is perfect in her housework and does whatever she is told, no matter how outlandish, as long as it doesn't involve smiling or revealing her past. She's been dispatched to the Asuda household where plenty of problems await, as the children have recently lost their mother and their father lacks confidence in his own role.