I have been greatly enjoying this wonderfully written and suspenseful visual novel so far; the gothic atmosphere, beautiful artwork, and music is so immersive, and the characters are so interesting!
However, I unfortunately encountered the same problem as werewolf9920, but only if I chose "Return To Your Room." If I Return, then as soon as the 9th day hits, the MC floats to the top of the screen, disappearing into the corner, and spends the rest of the story like that, never returning to their original position.
If I choose Approach instead, I get the Tristian CG, and the problem never occurs. I'm also a PC user, if that helps!