Sorry if I was unable to answer some of your questions previously. I think I do remember seeing a similar anime before, but after the video you sent me, Some of the stuff don't ring the bell for me, which could be the result of watching similar animes before, but not exactly the same as what you described to me.
1> I have no idea if it was a school. It could be a hospital for all I know. I do believe it was not a bathroom though. There was a utility sink in the room and a few lockers. They looked like work lockers. If I would have to make a bet, I would say it was likely a locker room. I don't think it was ever explained if this room was situated in a school. The beginning just shows the girls walking up to the room. There were like 3 or 4 girls, dressed in brown clothing, not sure what style of clothing though. one with white hair, rest with brown. There was no nudity in the show.
2> I don't know what you originally meant by "It felt ripped". The animation, the show in general, the characters? My best guess is that the characters at times, during parts where the camera was looking down onto the characters, were really terribly designed. It sort of looked as if somebody had clumsily pasted the characters onto the room layer. I don't know how to describe it, it was really weird, terribly done. Not sure about the animation though.
3> There could be some minor gore in there at the start, but the violence wasn't really all that intense. It only got gore-y near the end, everything was boring. I really don't remember the title, but I do re-call there being an idiom in English at the start, or that could be the title for all I know, the subtitles were all over the place. They do have some philosophical debate about something, can't remember what though. My best guess - they were talking about their future selves or their careers or something like that.
4> I don't know what the site was called. There were some innapropriate thumbnails. The videos were all alligned in the middle. It was not a pornographic site. I'll see if I can find it again, though. Can't make any promises. Each video opened up a new tab for some reason. Try to search up some OVAs from 1990-1995.
If you are looking for some gore anime, maybe try Another or Corpse party? There was not a lot of stuff going on in this anime, not really worth downloading. The blood looked like red lines, or perhaps smudges of red covering the face and hands of the characters. The suicide was another story though, it was more sad than scary or whatever.
Again, I might be remembering the wrong anime, so don't take my words for it. I really don't know much about it. Only seen it once, it was probably some anime that people are already aware of. I'll try to look for it.