One day in the middle of a record-breaking summer heatwave, her husband's subordinate, Sanada, came to her house carrying her husband, who was passed out drunk. Hiroka knew that her husband Ke'ai of her subordinate since he joined the company, so she treated him kindly, but...Sanada, forgetting that she was his boss's wife, fell in love with her. In the heat of desire, he pushed Hiroka down and had sex with her while her husband was sleeping...The two continued their relationship in secret, out of sight of others. However, as the summer ended, their separation came suddenly...