Homeless Mother VS Six Strange Sons

Chisato is a homeless girl being hunt by the debt collectors because of her father. One day, when she has nowhere to go for she was caught, Shinzo Okura appeared and paid the 100 million yen out of nowhere. When they were talking, Shinzo made a deal with her that if she marries him, her debt will be considered paid; Chisato agreed. However, when Shinzo died after a month, she was told that there are other conditions to be filled.