In a society where survival often necessitates exploitation, Kaoru Ushijima, known as the 'loan shark,' extends a risky offer to those in dire financial straits: a loan with a staggering 50 percent interest rate due in just 10 days. Ushijima operates in the shadows, catering to individuals trapped in vice and debt, determined to collect every yen lent out, regardless of the methods employed. Unyielding and unsympathetic, he pursues repayment ruthlessly, viewing his clients as unworthy of mercy. From illicit activities like prostitution to identity theft and coercion, Ushijima navigates the criminal underworld, unflinchingly subjecting his debtors to unimaginable hardships.