Overturned Demonic Rule

In a world where demons had seized control, humanity's last hope rested upon the shoulders of a remarkable young woman named Miyu Fukumoto. Amidst the despair and destruction, she secretly concocted a deadly poison capable of eradicating the demons. Aware of the risk, she devised a plan to administer the poison without endangering herself: a dart gun armed with poisoned darts. Now that her plan was set, all she needed now was a team. Can she assemble the last remaining survivors? And together can they save humanity?