A world of gleaming skyscrapers and hidden debts, where an innocent life is offered as collateral. When a father's desperation throws his daughter into the hands of a cold, powerful magnate, her younger brother steps into the lion's den to protect her, gambling his own life against a ruthless game of power and secrets. Can he navigate the treacherous currents of the Niran Group, uncover the truth, and save his sister before time runs out?

One flip of a coin, and you, the unassuming student known for nothing but your academic smarts, somehow beat the formidable President of Hyakkaou Private Academy in a gamble. Now, she's your 'personal pet.' But in a school where gambling dictates everything, this bizarre victory throws you into a whirlpool of power, hidden desires, and the terrifying allure of those obsessed with control. Can you navigate the dangerous games and tangled relationships, or will you become another casualty in their obsessions?