Reiko remarried Kenichi, who has two children from a previous marriage. However, Reiko's voluptuous and lewd body strongly stimulates her puberty-aged brothers, Kenji and Masao. Strangely, Reiko and Kenichi, who is on the night shift, miss each other and the two become sexless. The brothers then start fighting over Reiko, trying to make her their own. Masao shows off his innocently erect penis and demands that he satisfy his sexual needs, and Kenji, who sees this, later asks for her body, saying, "Do it to me too." The brothers' desires continue to twist as they seek Reiko...