「"That means you have 13 days to live," Said the demon. "If you don't purify yourself, I'll drag your soul down to hell."」
Hana has to live her remaining days with a very seductive demon and a very sweet angel. As a human, she must not fall in love with emortal creatures, yet it's difficult when they treat her with kindness and love. If she falls for the demon, she goes to hell. If she falls for the angel, she goes to heaven. But, if they both fall for her, they would be in big trouble.