Junko (Ohzaki Hibiki) has been in a relationship with her adoptive brother Koichi since long ago. Her father, who plots a strategic marriage, considers taking his business partner's son as a son-in-law but doesn't get along with Junko. One day, her father catches Junko and Koichi in the act. 'You ungrateful wretch,' he rages. Junko, forced to separate from her beloved brother and subjected to humiliation, faces a shocking truth... In the mansion of abuse where vaginal fluids echo, a triangular relationship is toyed with.
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