Intense brainwashing by the biological father and sisters: We are the new stepfather's sex toys. Miyu Aizawa, Nanao Ayatsuki, PRPM-002

[Miyu Aizawa & Nanao Ayatsuki, the most popular duo, become prey for their stepfather…] Miyu, the caring older sister skilled in housework, and Nanao, the innocent but trusting younger sister. The two live a carefree life with their mother's remarried husband—a wealthy stepfather. However, this peace doesn't last long… Once inside the basement… the stepfather's attitude changes drastically, revealing blatant lust and coercing the sisters into submission. The easily manipulated younger sister is lured into sex. The strong-willed older sister is restrained and forcibly impregnated. The stepfather manipulates them by exploiting their personality differences, completely dominating their minds and bodies. Unbeknownst to them, the two have become slaves vying to provide sexual services. "Our only value is to become our stepfather's sacs of pregnancies, I want to go first, I want to go first…!" They are brainwashed until only this thought remains in their minds…