By day, Miya Akatsuki is just a slightly grumpy and unsocial girl studying in St. Margaret's Girls' College. But by night she's secretly a Final Executor – an ultimate debt collector who can make even the shadiest debtors click the "accept" button on the payment warrant. The debt collection agency she works for, however, is a slightly different than normal ones. zz24

Haruki Kobayashi, a boy working in the electronics store of his family, becomes d with Miya after accidentally witnessing her at work. She and her two colleagues end up moving to Haruki's home as part-timers to keep an eye on him. Gradually Haruki starts to learn about the painful loss that made Miya want to obtain power.