My demonic harem

Humanity is losing. Without warning, an overwhelming alien civilization descends upon Earth, crushing every defense in its path. As the world teeters on the brink of extinction, humanity is forced to make an impossible decision: seek the help of the very beings it once feared. Beyond the ancient Demon Gates lies another world, home to powerful Demon Lords whose strength rivals the invading force. To stand a chance against the invasion, you must forge magical Pacts with them, earn their trust, and unite two civilizations that have spent centuries apart. Each Demon Lord has her own personality, ideals, and past. Some will challenge you, some will tease you, and some will take far longer to open their hearts. The choices you make will shape not only your relationships, but the fate of both worlds. Will you build an unbreakable alliance and save humanity? Will your decisions lead to sacrifice... or complete annihilation? Perhaps there is even a path no one could have imagined. Your choices matter. Multiple routes, romance, character-driven stories, hidden events, and several endings await those willing to discover them all. The fate of humanity begins with a single Pact.