Good game! The potential for a bad ending was there from the beginning, and I'm glad to see it actually exists. That said, I feel it could (should?) have been written more impactfully, so it leaves players who get it more satisfied. Maybe there could have been some thoughts about how at least you are fucking Ami and her plans over, or some flashbacks to times the girls said they'd rely on you, to make you question if that is really the right choice...
(Also, did I not reach far enough or does only chapter 1 have a title card?)