Nobody knows

In a dimly lit, green-hued room, one anime character lies motionless on the floor while another sits beside them, holding a knife; the scene cuts to a black-and-white close-up of a character with white hair and a knife, accompanied by the text "I want to kill," followed by a close-up of a character with purple hair and blood on their face, then a shot of red roses with the text "We were lovers before we were even born in this world," and finally a black screen with the word "Timeless" in white text.