Riona, a wife, was living a fulfilling life together with her husband. - Riona takes on the responsibility of caring for her father-in-law alone when her husband goes on a business trip, but Riona is irritated by her demented and lewd father-in-law and can't help but raise her hands. - The next day, Riona feels indebted to her father-in-law and is raped by her lustful father-in-law while she is caring for him. - Riona resists, but due to her father-in-law's honest caress, she climaxes and enjoys a pleasure she hasn't felt in a long time. - Riona is attracted to the act of her father-in-law who is greedy for sex even though he is old...