After her husband dies from illness, Miyu is left behind with her adult daughter Ai. The one who offers them help is Yuji, the deceased man's younger brother, who had promised his dying brother to care for them. Yuji has always wanted Miyu and reluctantly agrees, beginning a three-person household with Miyu and Ai, whose 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 then subjected to relentless abuse, creampie training, and forced submission.