ZC is a normal girl. She goes to school, has a couple friends, and gets good grades. Then, one night, she's invited to her friend's place. She's not a party person, but goes anyways. She finds out that's a mistake as her soul gets sold to a demon in exchanged for power by her best friend. Now she has to use these new powers to try to avoid being trapped in the underworld forever after she dies. Can she do enough good in the world or will she become another soul trapped at Midnight?