Yua Takeda Gender-Bent G******g

A younger brother's kind older sister 'Yume' learns one day that her brother is being bullied at school. Desperate to help him, she disguises herself as a boy and infiltrates the all-boys school he attends. She tries to stop the bullying by getting a hold of the ringleader's weakness, but instead, her own greatest weakness is discovered: that Yume is a girl. She is immediately preyed upon by savage men, and a nightmare of gang rapes begins.