Drugging someone to the point of mental blankness and forcing incestuous sex; brutally raping her beloved older sister; Ayaka Mochizuki DDK-208

Ayaka, a karate expert with a strong sense of justice, confronts a gang of thugs to protect her younger brother who is being bullied at school. However, her brother is captured and taken hostage, leaving her no choice but to obey the gang's demands...