"I will not fly in the air. I will not hide in shadows. I will not turn into fog. I will not turn into darkness. I will not disappear. I will not shape-shift. I will not use my eye power. I will not even materialize matter. Needless to say, I will not even use the demon sword 'Kokorowatari'...... the Kaii Killer blade. In other words, I will not use the active abilities of a vampire -- I promise. Of course, thou can use them -- though what thou art able to do is, at best, to shape-shift the tip of thy arms."

(Kizumonogatari, ch. 17)