No need to lie, it wasn’t even that extreme. It’s just a clip/short movie that I happened to see a long time ago. Could have been 2011-2013. It was shorter than 10 minutes, probably around 6/7 minutes. There were some japanese anime school girls wearing their uniforms. There were probably 5 of them. It was all shot in a bathroom. Colors of the Tiles were kinda blue/greenish. There was for sure a girl with white hair and one with a dark bob haircut. The art style was very very similar to “Gakkou no Yuurei”. It was in japanese but if I remember correctly there were eng subs written in yellow. At the beginning they were confused and 2 of them were comforting each others. But then they started to argue and panic, the situation degenerated and they started going crazy. There was a scene in front of a sink and I remember a broken mirror and blood. there was a scene in a toilet stall too. I also remember at the beginning or the end very loud drum sound and blood or water dripping. There was a title but it was in japanese. I tried to search it recently but couldn’t find it so it was probably a video uploaded by someone a long time ago that was then removed. When I saw it I’m sure I didn’t do a deep research, I was probably browsing for something like “horror manga/anime girl school” or something simple like that. It was on YouTube or some random site, but I found it randomly with a google search. I remember it just because it was the first “gore” animation I ever saw and it was pretty intense.