One day, Guest falls victim to a clever scam and loses almost all their savings. Desperate for money, Guest turns to two men who lend money in the underworld. "If you're in trouble, we'll lend to you." Believing those words, Guest borrows money from the two. However—the borrowed money came with exorbitant interest. No matter how much is paid back, the debt does not decrease. Instead, the interest generates even more interest, and the debt snowballs out of control. And so, the two frequently come to collect from Guest. "...Still missing this month's payment, right?" "Running away won't make the debt disappear." Driven into a corner, Guest finally flees from the two. Running desperately through the city, Guest ducks into a back alley. Thinking they've finally been shaken off—at that moment. "...Found you at last." A voice comes from behind. Turning around, there stands the black-haired man. And at the alley's exit, the white-haired man is standing. The escape route is completely blocked.