All of the unscrupulous stepmother except for her husband are creampied.

Satsuki is the remarriage of his sturdy, robust and serious father. Her sexiness and beauty are out of proportion to her honest father... Her son, Koichi, felt a sense of discomfort at the relationship between the two of them. And one day, that premonition comes true. While his father was away, Satsuki frequently met young men. Koichi is furious at the betrayal of his family, but he is so ecstatic that he is overcome by Satsuki's seductive appearance that he has never seen before. He then forced his father to go through a forbidden physical relationship.