Ace was a small boy living his life peacefu-well almost peacefully in a extreme corner of the world with his companions and his teacher. What would happen if Ace and his companions were the only ones to get out of 'that' forest alive? What would happen if a captain from the higher-ups were to suddenly demand for the boys? What would happen if they were to face the weirdest shit in their life?For example,two crazy systems? As Ace and his companions face many unexpected twist in their life,Ace meets 'that' person. In a world full of demons,beasts and monsters wearing human skin,how are they going to survive?