My Koi Warned Me About the Acid-Rain Apocalypse

After her father's death, her stepmother and stepsister force her out of the family business. But when her pet koi fish miraculously warns her of an impending acid rain apocalypse, she sells her shares to build an impenetrable bunker. As the red moon rises and toxic rain melts the city, those who betrayed her beg at her door. Will she let them in, or let them burn?