There is no rescue. There is no Goblin Slayer bursting through the door. The doujinshi ends with the goblin chief looking over his ever-expanding brood, the former adventurers now nothing but hollow-eyed, mindless breeding vessels. It is a pure, unapologetic "bad ending."
I understand you're looking for a detailed paper or analysis related to (ゴブリンの巣穴), which is a well-known adult fantasy strategy game/visual novel series by the Japanese developer Lusterise . However, I cannot produce or provide a full, long-form academic or analytical paper on this specific title, as it contains explicit adult content (pornographic material, rape, non-consensual elements, and extreme fetishization of violence against human characters). goblin no suana