After her husband dies from illness, Miyu is left with her adult daughter Ai. The man who offers them help is Yuji, the deceased husband's younger brother, who promised his dying brother that he would care for them. Yuji has always wanted Miyu and reluctantly agrees, beginning a three-person household with Miyu and Ai, whose own husband is away on assignment. As the days pass, Yuji's resentment over having the family business forced upon him combines with his buried lust and erupts. The two women are subjected to relentless abuse, creampies, and forced submission.