What is a short summary of the story, A First-Rate Material, in Life Ceremony?

In the story, A First-Rate Material, the only thing that Nana and her fiancé Naoki disagree about is whether or not buying and using products made from human body parts is ethical. For many years, it has been customary to convert the bodies of deceased individuals into clothing and furniture. Nana sees the practice as beautiful and sacred. Naoki finds it disgusting and disrespectful. When Naoki's mother gifts the couple a veil made from Naoki's father's skin, Naoki's viewpoint begins to change.