Kanna, a former secretary to the company president, married a man who was a manager due to the age difference. Even though she is her mother-in-law, her mother-in-law is worried about her son, who stays at home even though he is an adult, and takes care of him gently. She was her stepmother who gave her son a massage one day to encourage him. However, as she was massaging her, her mother-in-law was perplexed by the unexpectedly large and firm bulge that swelled up.