So the whole trial and what happened to the sister were just part of the FL's imagination?
No, I think thay Aoi Wakana's character is one of those antisocial, quiet types who look down on outgoing people but never try to open up or improve themselves. Besides, based on the other girland her friends' comments when they saw Aoi's drawings, the judge and other characters at the trial were fictional and just drawn by Aoi.
Subs: https://subscene.com/subtitles/the-legacy-of-dr-death-black-file/big_5_code/2451261
Don't know where the raw is tho :(
You just need to find the raw