Kakoi ~Zetsubou no Shojo Kangokujima~

The protagonist witnessed his girlfriend gangbanged before him. She committed suicide and he given up his life doing bad things.
One day he got cheated and came to an island. This island was possessed by an syndicate, with rules of their own.
3 virgins were brought to the site without knowing what the place is for. He was ordered to take extremely horny pictures of themselves.

[edited from DLsite]