In a world where miraculous abilities are limited to a chosen few known as 'Minimum Holders,' the detective agency Yokohama Troubleshooting, nicknamed Hamatora, is run by the duo of Nice and Murasaki. Situated at Cafe Nowhere, their modest headquarters, the team eagerly anticipates new clients seeking their unique skills. As they delve into their latest assignments, a troubling pattern emerges—each task is eerily connected to a string of murders committed by a serial killer targeting Minimum Holders, a group to which Nice and Murasaki belong. With their friend Art hot on the killer's trail, the duo must confront the chilling truth behind these atrocities and uncover the mysterious bond tying Nice to the mastermind orchestrating these heinous acts.