The legends say, if you manage to climb the top of the Tower of God, any wish you might have will be fulfilled. The series focuses on Rachel, who is afraid of the darkness and cannot live in the gloomy world anymore. Despite her friend's wish for her to stay, she opens the door to the Tower and begins to ascent. Her friend Bam does not want to lose her and decides to follow her. However, those who are not worthy will be killed.