Her husband's brother, who had been missing, suddenly came to visit. Married woman Erina is afraid of her brother-in-law. Her husband, however, was innocently happy to be reunited with her brother. And then an abominable event... Erina's brother-in-law barges in on her husband while he's away, and Erina is forcibly held in his arms. Although she is tormented by a strong sense of guilt, Erina finds herself beginning to be attracted to her brother-in-law's roughness.