In a world where monsters reigned, a god gave powers to people in human world in fear of getting overthrown by the monsters.  Taeyeon, Jessica, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona & Seohyun were 9 of them. Fighting off the many monsters they encounter, they learnt to control their powers and use them. As they slowly fought off monsters from the other world, some started falling in love with others. Will their love be an obstacle, or something that proves to be useful?