The second entry in the series is here. Shiori and Yuria are restrained as sex slaves in a locked room beneath a mansion, and their master orders them to explain the rules to newcomer Miu. His debt-repayment game promises to erase their debt if they earn 100 million points within one month: taking the master's cum in their pussies earns three million, reaching orgasm earns 500,000, but being caught faking one resets the total to zero. These troubled busty women are reduced to obedient sex slaves.