Here's a rough time line
Marine and Miko did the stream where she put the doujin in the fridge for marine to find.
Marine found it had a good laugh, and read a few lines from the back of the book
The doujin artist saw a clip of that and made a few tweets about it not being fair that others were profiting off her work
Those tweets got picked up by shitsttirers and blew up, also alot of misinformation got thrown in at this stage so the narrative became Marine and Miko read the entire doujin on stream and mocked it while making money off it.
Huge fucking flame war between vtuber fans and bl doujin fans with vtuber antis fanning the flames
That was last Monday, you can figure out the rest by catching the video