I have a theory on how to get the true ending. It has to do with getting the soul binding thingy in the curio shop after frenni's upgrade, it might have to be used on Marie. Doing so might allow you to get the true ending because then you can have some steamy time with her, idk
10 days ago(+2)
*P.S. this account was my cousins about 9 months ago, but he died sadly, and now I own it.*
9 days ago (+1)
Your cousin was based and I'm sorry for your loss.
Edit: please clear their search history.