“Uncle, please... don't bully my little sister, Mion... (I'll protect Mion.)” Shion is a caring older sister with a slightly overdeveloped sense of justice. Her wicked uncle, knowing her personality, turned it against her and threatened to lay a hand on her little sister, Mion... Shion, her older sister, acts as a shield and desperately tries to protect her. Driven solely by the desire to save her sister, she writhes her hips wildly to please her uncle, but after being drugged with a stimulant, her mind goes completely haywire… And so, she is relentlessly raped by her uncle until he cums inside her.