Raped in front of my husband - False visitor

Mayumi Inoue (Kanazawa) was blessed with her long-awaited child, and although she is busy raising the child, she is spending a fulfilling life with her husband who is obsessed with children. One day, an insurance salesman visits the Inoue couple. The couple, who were considering joining for the sake of their child, happily invite them into their home to hear what they have to say. Without knowing the man's true identity...