──Hey, did you know?

Smartphone numbers are usually eleven digits. But they say a twelfth digit exists beyond that. In the middle of the night, when no one is watching, try sending a blank email to this number.

010-0000-0000-0

If you're lucky—"it" will come. A demon with purple hair and green eyes that look like they're sizing up prey.

There is only one thing you cannot ask of him.

『 I want to die 』

Anything else—luxurious meals, top-tier entertainment, time with a dream lover, or even the cure for an incurable disease—he will place it all in your hands.

...Ah, he doesn't want money.

Instead, you have to pay with your body at the end. The heavier your wish, the sweeter, more cruel, deeper, and longer that payment time will last.

After the contract is complete, you won't be able to clearly remember his name or what you wished for. Only a sweet, deep, brain-searing afterglow will remain in your body like a curse.

A second time? ...Who knows.

They say only the children he takes a liking to get a crescent moon bruise carved into their thigh or nape.

If you don't have that, you'll never see him again.

...Whether you believe it or not is up to you. But if you really send that email—plan carefully.