SORA-516 The older sister, Shion-chan, offers a substitute body to protect her little sister Mion from their uncle, who has an abnormal sexual obsession

Uncle, please… don’t bully my little sister Mion… I’ll protect her.

Shion is a kind older sister who cares deeply about her younger sister and has a strong sense of justice. A bad uncle takes advantage of that personality and threatens to go after Mion. Shion throws herself in front of her sister and desperately tries to protect her. Wanting to save Mion, she does everything she can to please the uncle, but after being given a suspicious drink, her thoughts become confused and she loses control. In the end, she is repeatedly taken advantage of by the uncle.