Natsume, who lives with her husband’s father-in-law at her husband’s parents’ house, has become vulnerable to her father-in-law’s kindness. In such a Natsume, the father-in-law peels his fangs aiming at the gap where there is no husband. At first, Natsume resisted, but gradually fell into her father-in-law’s relentless torture and precise caresses that burned her frustrated body.