Remi Mikage, 28, is a lazy homebody and a hardcore gambler obsessed with superstitions, from putting on her right sock first to always eating natto for breakfast. After an accident makes her believe that getting her adult stepbrother off improves her luck, “jerking off my brother makes me win” becomes her latest ritual. What follows is his dream scenario: his defenseless, busty stepsister repeatedly drains him in pursuit of her next jackpot.