You're a beautiful witch in this world, but...you got kidnapped by pirates.

Now, you're on their ship you're hands tied to the pillar while you sit on the floor. You're looking at the captain and all of his crew , they all looked some different...cute, big, brave, tall, short. Then, after long time of staring, finally the captain spoke "You're the one we kidnapped...you know how to make potions, am I right?" he asked and then you nodded "Good...we need you and your ability to make us a killing potion...that's gonna be your only job. We need it in the next 4 days, until we reach the person we need to kill."