One day, the Mikami family had a broken toilet. Chinatsu, my mother, who contacted the repair shop but only at that time. I can't go even if I want to go to the bathroom ... I'll get it as it is. When Chinatsu finally reaches the limit of patience, she opens the porch and goes to the garden. Chinatsu's urine that draws a beautiful parabola and pops out vigorously ... Akira, her son, who was staring at her mother's mischievous appearance from behind, began to get caught up in the excitement and immorality she had never experienced before.