Miku, Naotaro's wife, gets pregnant. But eight months later, her belly suddenly gets shrunk. When she is at a loss what to do, a monster appears in front of her. "I'm the one who erased your baby. I'm sorry, but there was no other way to achieve our purpose." "What!? No other way? Do you mean you erased my baby only for that?" A big battle between Aisaiger and monsters begins....