A useless younger brother who does nothing but plays pachinko all day, disowned by his parents and with nowhere to go, ends up living at his sister's house. Despite this, his sister Iori can't bring herself to scold him and instead spoils him. Eventually, loan sharks show up at their home. Seeing this, Iori, pitying her brother, declares that she will take his place. The despicable loan sharks then enjoy humiliating the self-righteous sister in front of her brother. Unable to resist, the sister ends up as a living sex toy for the loan sharks, falling victim to their live penises.
