incest son, shiko tono reiko.

Reiko, who was not satisfied with the sex with her husband she married again, became interested in her son Shinpei's wonderful otchin when she saw it in a day shower, and when she touched the crotch that is growing up trying to wake Shinpei who was sleeping on the sofa, she fell in love with her incest and came across the last line and came to an aquame of extermination.