STAR-976 Takeda Yume was exposed for dressing like a boy and was then assaulted by a group…

Yume, a kind older sister who cares deeply for her younger brother, learns one day that he is being bullied at school. Determined to help him, she disguises herself as a boy and sneaks into the all-boys school he attends. She tries to stop the bullying by uncovering the weakness of the main instigator, but instead her own greatest secret is exposed: Yume is actually a girl. She is soon targeted by cruel men, and a nightmare-like series of ordeals begins.