The End of an Era: Rebuilding on the Ashes

I don't know when it began, but it seems I've lost a piece of my memory. Everyone around me deliberately avoids the subject, refusing to speak of it, as if they're afraid I'll remember the past. Until that night, when the colossal moon suddenly fell from the sky. It wasn't an illusion. The moon crashed into the earth! Wormholes tore open across the globe, and ferocious alien beasts and twisted creatures born of obsession descended upon the world. Scorching light swept across the seas. The earth collapsed, mountains and rivers were overturned, and billions of lives were plunged into misery. An ancient civilization that had endured for ten thousand years was utterly destroyed, and all order in the world was reduced to zero. Everyone said the moonfall catastrophe was an accident of nature. But I clearly saw fragments of the truth: This world-ending calamity was never a coincidence, not from the very beginning! Across the Great Beyond, at the mouth of the River of Forgetfulness, bells toll, ten thousand spirits appear, calamity demons awaken, and flowers bloom in profusion. A sealed dimensional experiment, the fate of a reincarnating Heavenly Demon, and memories of a life that had been altered, all are gradually revealed. I am Nanyun, Experiment Subject 009 of the dimensional experiment... and the only one who can shatter the game and turn the tide. The old era sank into ashes. I will reshape the new age. When mechs split the sky and the dark moon descends, all calamities will bow. Above the dust, I will wield my blade to tear through the world and return as a god. “Nanyun, I await your return on the Other Shore.” [Mecha apocalypse + dimensional fate + supernatural realms + one heroine + reshaping the post-apocalyptic world]