The background is a world dominated by humans, under the rule of a world government
"Doctor."
I raised my head and saw my patient sitting across the table. He licked his lips and smiled, showing his white teeth: "Prescribe me some blood."
I adjusted my glasses and said in a dilemma: "Your quota for this month has been used up."
He raised his thin arms, and the blue blood vessels snaked under the pale skin: "I am growing, and those are not enough. You see, I have been raised to be so thin."