Sisters Momoko and Karyin were raised in a wealthy household. However, one day their parents suddenly died in an accident, and they were taken in by their uncle's family. Though tense, they encouraged each other that as long as they had each other, everything would be okay, and went to their uncle's house. The uncle who greeted them seemed kind, so Momoko and Karyin slept soundly, relieved. However, the next day, when Momoko and Karyin woke up, they were shocked to find themselves naked with handcuffs on. Their uncle approached with a lewd smile, revealing his intense hatred for their father. He declared that from that day forward, they would compete in sexual servitude to prove who truly loved him as his 'daughter,' and the loser would be cast out with nowhere to go.
