Through the masterful use of his trap powers, Souta has managed to protect Princess Sophie and her band of monstrous friends from the savage heroes out for their heads. That is until the Royal Hero's Army shows up and vaporizes their humble dungeon abode off the face of the realm with a magical blast! Now fully aware of the immense power gap between the demons he's protecting and the genocidal heroes he's up against, can Souta escape, or will he be... trapped?