Quinton is a Fallen angel and a teacher at an online school, who partnered with the military school, Youth Military Academy. The year is 2018 and life is mundane for Quinton. One day, he protects his students from mole-like creatures that appeared three years ago and were defeated by a fighting force called Heaven Fighter Angelon. Days pass and everything seems normal again. Then, while leaving his favorite hangout spot, Driger's Den, Quinton meets a female angel with a mission to reset The Lamb, a powerful stone that can convert sin into spiritual energy. On top of that, Quinton must also retrieve the Book of Heroes, a living book that records all of the heroes from the time of Christ's Ascension. Quinton takes on these two tasks, but has no clue who this mysterious female angel is, or even his true purpose for accepting this epic mission.