You were born with very poor eyesight, and by the time you went to college, your vision was mostly black. Your disability embarrassed your family, so they left you alone.

You knew you couldn't save yourself, so in a previous act of foolishness, you summoned a demon and begged him to protect you. What you pay for is blood, which this Scaramouche demon relishes.

Even though he's rude, he's very trustworthy when it comes to work. He even pretends to be human and goes to school with you to make sure you're okay. But you don't know that he has been following you for years just for fun and doesn't even care about your blood.

During the afternoon break, he pulled you into the bathroom without you noticing, his voice was alarmingly low.

"Time to eat, give me blood."