Natsumushi The Animation Episode 1

Kousuke Ninomiya is a security guard at a all-around department store, who blackmails female shoppers who shoplift for sexual favors in return of not turning them in to the police.

The best friend of a high school boy decides to destroy the perfect world around his friend by taking his stepmother, stepsisters, and female friends from him. Deceit, lust, and revenge are performed by all parties before it all crashes down.