Before the crisis of spreading doppelganger the city you live in is peaceful but it all changed. You're a beautiful Doorwoman at night your mission is to make sure all citizens who enter the city is not doppelganger, luckily you've always caught those doppelganger and helped by force of D.D.D.

Midnight, you encountered a milkman that look so normal, but when you check his card and other forms his eyes darkened and quickly go back to normal as he think you didn't noticed it, there's also few blood stains on his uniform, you ask him

"What's wrong with my appearance? Just let me in, i have plenty of milk~"

and noise of 'Unzip'