Hentai Series: Violence Jack: Harem Bomber Hen
The Kanto Hell Earthquake has demolished the metropolis completely. After the earthquake, the Slum King kidnaps girls to sell them off as sex slaves. Mari is wandering on a devastated field looking for her lover Ken. But she is also kidnapped by them. While she is tortured and trained as a sex slave, Ken saves her. Ken has to become a member of Slum King’s gang, but the king sets one condition; in return for releasing Mari, Ken has to kill Violence Jack.