As far as I've found, I haven't noticed any new animations replacing older animations, but as quickly as I could tell, after you get the mission where you can kill flies, if you go to the dojo(?) and pick the fourth dialogue option in the subgroup from either the second or third option to the main choices, the main character and the dojo guy will talk a bit and when you try to leave, you'll be attacked by some dude(Mendes, I think?) and his henchmen. The losing animation takes a bit before progression, but getting stomped on four or five times got Mendes to initiate a sex scene. After the sex scene occurs about five times, his henchman will join in and you'll get the option to give up. It won't be a game over, but kind of like losing to the testers and not choosing the second dialogue option during the CG. After you give up and the CG plays, a short cutscene will play and the dojo master/whatever will beat them up. Going to the Bar Hole, you will meet up with your buddies Mendes and henchman, where choosing the second option will show a CG of Mendes screwing you in what seems to be a bathroom. Choosing the first option has you beating them up, and an indirect mission seems to become available where you talk to the dojo master and he seems to want something from the nightclub that you can get to along the same walkway to initially go to the ship terminal(?). Getting the one for 500 monetary units just seems to have a short cutscene where the dojo master kicks you out, but you can return to the dojo. I haven't tested to see what occurs by giving him whatever you buy for 2000 or 10000, and as far as I know, there is no level after the fly level.
I don't understand Japanese, so as far as story progression goes, I couldn't tell you how that goes and if anyone can find anything else to add to this, or even a more accurate description of events, along with others, I would be appreciative.