After his father remarried, Tarou started living with his stepmother and stepsister. His stepsister 'Rena,' who is one year younger, seemed to always have a smile on her face and appeared kind, but during their first meeting, despite their parents being right next to them, she gave him a footjob under the table and made him ejaculate. From that moment on, Tarou was fated to become his sister 'Rena's' 'sex slave.'
