ジェラシー

An ordinary Japanese young man named Fujibayashi Kotarou was playing a computer game at his friend's house. Upon returning home at night, he was approached by mobsters, who demanded money. With debts everywhere and without real means to earn money, Kotarou opts to work for a dubious night club manager as a host. He finds it hard to adjust to the new life style, which brings not only danger and violence, but also sexual experiences he hasn't even dreamed of before...

[From Moby Games]