[She wouldn't know whether that's true or not. All Shiki knows about nighttime walks is that she's always taken them only for one reason, this.
She'd tried. Tried to-- go on like everything, like she was okay, and that she could just outlast this and stay how she used to be. To suffocate the overwhelming murderous intent, now to the point that the woman even edges away from her, like she's seen so many times before, in the instinct to flee in the face of danger. But she can't have her run away-- not now-- and it serves as the trigger to set her in motion finally.
Crossing those remaining few steps with a single one, she slides up close to the other girl while reaching back to tightly grip the kitchen knife, and the rest is settled very simply. Her hand thrusts forward with it, burying the blade into the woman's chest as it slides through meat and bone with impossible ease up to the handle, piercing the heart]