The obedient W-type beautiful girl, who is continuously violated by a ruthless older man (stepfather) in a place unknown to her happily remarried mother. Nagase Mitsuki, Nagase Yui MIAA-291

Mitsuki and Yui are sisters with different fathers. Their mother is heavily in debt, and the sisters live in poverty. One day, their mother happily announces that she is remarrying, and her wealthy stepfather will pay off the debts. However, unbeknownst to her, her stepfather continues to sexually assault the sisters...