Kaeriuchi!

Maki is a karate girl with a strong sense of justice, so in order to end the ongoing criminal incidents involving perverts she uses her little sister Asuka as bait in order to drive out all the perverts. However, her plan backfires and both her and her little sister are captured.

Maki is humiliated time and time again, losing her virginity by force right in front of her little sister.
The perverts get more and more sadistic until finally little sister Asuka falls victim to their evil.

Samples are available at our official site.
http://studio-gaudi.sakura.ne.jp/