Atashinchi no Danshi is a drama that talks about family, is full of comedy and a little, tiny bit of romance. Is the story of a homeless called Chisato, her father left her with a debt of 100 million yen that's why she is always running away from tha loan sharks as a homeless person. One day she meets a man who offers to pay her debt if she marries him for one month. She accepts the offer and spends one month with that man, named Shinzo until he dies.
After Shinzo's death Chisato thinks she is free to go, but there's a catch!!! Shinzo left a set of conditions to let Chisato free of the debt. His lawyer informs Chisato that she has to spend 3 months living in a castle with Shinzo's 6 sons (who he adopted in order to have a successor) and act as their mother.
Chisato is reluctant at first, but then decides to fulfill the conditions, because she can't pay the money back. So this is pretty much the premise of the drama.