"Uncle, please... Don't bully my little sister Mio... (I'll protect Mio)." Shion, the older sister, is fiercely protective of her younger sister and has a strong sense of justice. Taking advantage of this, her perverted uncle threatens to harm Mio unless Shion submits to him... Shion bravely steps in to protect her sister. Driven by her desire to save Mio, she desperately tries to please her uncle by grinding her hips and gets drugged, her thoughts becoming muddled. As a result, she's relentlessly raped by her uncle and ends up creampied.