The event for the 46th day does not trigger automatically. Neither for the good, bad or NTR ending. The only ending that works is through the one with the research of the bionic body which is actually an alternative ending. So the game has 4 endings.
I did brute force the event with MTool however but thats far from optimal.
Apparently there is a bug fix already floating around. You gonna need to use this.
Oigan alguien sabe como se arregla esto, se supone que estoy en la escena de sexo con caroline usando el outfit taimanin
For some scenes the dev forgot to add an "FadeIn Screen" event string so the scenes happen but the screen stays black. Either wait for a bug fix or use MTool. I can't stress enough how easy it is to bug fix this stuff for yourself with this tool.