Kinbaku: Itaburu!

A man and his two siblings run a company. However, the younger brother is a spendthrift, and they are constantly fighting. At home, he has lost love for his wife and lives a lonely life. One day, an innocent-looking woman appears before the man. She says she is looking for work. Attracted by her innocence, the man decides to keep her at home as a maid. From then on, strange events begin to occur one after another for the man. In fact, the woman approached the man for a certain purpose. The brothers are unaware of this, and gradually become captivated by the woman. What is her purpose...?