A woman, Aoi Reina, who became addicted to sex after being imprisoned by her brother who lived alone and saw his penis, turned on the switch. (REAL-772)

The younger brother, who came to his older brother's house to help look after it, found a woman imprisoned with her hands and feet chained... After freeing the woman and washing her filthy body, the seemingly calm woman suddenly transformed into a lewd and obsessive woman, attacking his penis...