Sorrowful mother incest adultery house

A mother and child live in a mansion with no light. She lives a gloomy life with her son who has a strange disease that causes him to die when exposed to sunlight. Sayuri is obsessed with discipline to the point of paranoia. A strange and immoral habit with my son, who is filled with a sense of confinement as he just repeats the same daily routine. And the shadows of lewd men crowding around Sayuri's soft skin. However, even more than that, the mother and child tremble with the forbidden incense, and there is a cursed secret...