already spent many hours on this game getting every ending except that on i guess, so would not really be spoiling.
If I remember, it's at the beginning.
Like if you don't have enough stats at day X, you have a scene with the human girl and game over (don't remember much, so if someone can confirm this ).
I think I had this bad end and had to try again from scratch.
Maybe there are others conditions to trigger the bad end (or maybe there are others bad ends).