I am the real daughter of a wealthy family, but I have become my step-sister's "human cash machine". Just because I was bound to the exchange system by her, for every point I spent, she got one more point. After being drained of all my value, I was kicked out like garbage. That night, I stood barefoot on the rooftop in the bitter wind and rain, but she spent the night with my fiancé. When I jumped down, lightning struck my soul. When I opened my eyes again, I was back to the day after I was locked by the system.