Banging in the Gym: A Sweaty, Athletic Fuck Fest

The description of this adult animated movie goes like this - A young man named Taka is on his way to meet a friend for lunch when he gets lost in an unknown part of town. As he tries to find his way back, he stumbles upon a mysterious house that seems to be holding some kind of underground sex club. Inside, he witnesses all sorts of naughty activities including group sex, orgies and public displays of pleasure. As he becomes more aroused by what he sees, he decides to join in the fun and soon finds himself indulging in all kinds of depraved acts with strangers and even his own friend who had accompanied him earlier. Will Taka be able to keep up with the wild pace or will he get overwhelmed by his lustful desires?