Reiko is 31 years old and has been married for six years. She doesn't have children yet. Raised in a wealthy family, she has never experienced material hardship. Due to her father complex, she has always been attracted to older men. She was proposed to by a professor she had admired since college, and immediately agreed to marry him. For the first few years, she had no complaints about married life. However, she gradually began to realize her sexual desire was growing stronger and stronger. Reiko, who had never been involved with other men before, confided her struggles to her closest friend. A few days later, the friend introduced her to a man.